The best for beginners:
Petersen, James F. (1988) Enchanted Rock State Natural Area: A guide to the landforms. Terra Cognita Press, San Marcos, Texas, 56 p.
[90% of the stuff I know about the landforms at ERSNA comes from reading this book, which is unfortunately no longer in print.]

Williams, John (undated) On your way up. A trail guide to the top of Enchanted Rock. Texas Parks and Wildlife Department, Austin, Texas, 24 p.
[Should still be in print and available at the park, but it apparently is not.]

Last Christmas I got this book called "The Granite Landscape - A Natural History of Amercia's Mountain Domes, from Acadia to Yosemite" by Tom Wessels. Even though he snubs Texas completely, there is some good info about granite landscapes and particularly about granite-based vegetation.

Adams, John A. S., Kline, Mary-Cornelia, and Rogers, John J.W. (1960) Thorium and uranium content of the Enchanted Rock Batholith, Texas, Geological Society of America Bulletin, 71 (12, Part 2), p. 1811.

Anderson, J.L. (1983) Proterozoic anorogenic granite plutonism of North America. Geological Society of America Memoir 161: 133 154.

Anderson, J.L. and Smith, D.R. (1995) The effects of temperature and f02 on the Al-in-hornblende barometer. American Mineralogist, 80, 549-559.

Barnes, V.E. (1952a) Geology of the Hilltop Quadrangle, Gillespie, Llano and Mason Counties, Texas. (GQ 2) The University of Texas at Austin, Bureau of Economic Geology, scale 1:31,680.

Barnes, V.E. (1952b) Geology of the Crabapple Creek Quadrangle, Gillespie and Llano Counties, Texas. (GQ 3) The University of Texas at Austin, Bureau of Economic Geology, scale 1:31,680.

Barnes, V.E. (1981) Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.

Barnes, Virgil E. (1988) The Precambrian of central Texas. in Hayward, O.T., ed., Centennial field guide Volume 4: South-Central Section Geological Society of America, Boulder, Colorado, p. 361-368.

Barnes, V.E. , Dawson, R.F., and Parkinson, G.A. (1947) Building stones of central Texas. University of Texas Publication no. 4246, 198 p.

Barnes, V.E., Romberg, F.E., and Anderson, W.A. (1954) Correlation of gravity and magnetic observations with the geology of Blanco and Gillespie Counties, Texas. Congres Geologique International, Section IX, Contributions de la Geophysique a la Geologie, 152-156.

Barnes, V.E., Romberg, F.E., and Anderson, W.A. (1955) Correlation of gravity and magnetic observations with the geology of Blanco and Gillespie Counties, Texas. The University of Texas at Austin Bureau of Economic Geology, Miscellaneous Map #7, scale 1:190,080.

Bierman, Paul R., Massey, Christine A., Gillespie, Alan R., Elmore, David and Caffee, Marc, (1993) Erosion rate and exposure age of granite landforms estimated with cosmogenic 36Cl. Abstracts with Programs - Geological Society of America, 25 (6), p. 141.

Billings, Gale Kilmer, Major and trace element relationships within coexisting minerals of the Enchanted Rock Batholith, Llano Uplift, Texas, p. 79, 1963. Doctoral from Rice University, Houston, TX, United States

Blank, Horace R. (1951a) Exfoliation and weathering on granite domes in Central Texas. Texas Journal of Science, 3,3, 376-390.

Blank, Horace R. (1951b) "Rock doughnuts," a product of granite weathering, American Journal of Science, 249, 11, 822-829.

Buchanan, P. C., Degenhardt, J. J., Jr., Reid, A. M., (1995) Features resembling pseudotachylyte at the Enchanted Rock Batholith, Texas. in Sears, Derek W. G. (editor), 58th annual meeting; Meteoritical Society; abstract issue, Meteoritics & Planetary Science, 30 (5), p. 492-493.

Cooper, Carolyn (1993) Schlieren at Enchanted Rock State Natural Area, Llano County, Texas. The University of Texas at Austin unpublished Senior Honors Thesis.

Folk, R. L., and Patton, E. B. (1982) Buttressed expansion of granite and development of grus in central Texas. Zeitschrift fuer Geomorphologie, 26, 1, 17-32.

Garrison, J. R., Jr., Göbel, V.W., and Hutchinson, R.M. (1986) Origin of the Precambrian granites and associated metamorphic rocks of the Llano Uplift, Texas: Field Trip No. 13. Geological Society of America Annual Meeting Guidebook Series, 142 p.

Goldich, S.S. (1941) Evolution of the central Texas granites. Journal of Geology, 49, 697-720.

Hoskin, Charles M. and Sundeen, Daniel A. (1985) Grain size of granite and derived grus, Enchanted Rock Pluton, Texas, Sedimentary Geology, 42 (1-2), p. 25-40.

Hutchinson, Robert M. (1953) Petrology of Enchanted Rock pluton, Llano and Gillespie Counties, Texas. Ph.D. dissertation, University of Texas, Austin,

Hutchinson, Robert M. (1956) Structure and Petrology of Enchanted Rock Batholith, Llano and Gillespie Counties, Texas. Bulletin of the Geological Society of America, 67, 763-806.

Hutchinson, R.M. (1986) Enchanted Rock and Sixmile Pluton Trip, Llano and Gillespie Counties, Texas. in Garrison, J. R., Jr., Göbel, V.W., and Hutchinson, R.M. (eds) Origin of the Precambrian granites and associated metamorphic rocks of the Llano Uplift, Texas: Field Trip No. 13. Geological Society of America Annual Meeting Guidebook Series, p. 51-99.

Hutchinson, Robert M. (1988) Enchanted Rock dome, Llano and Gillespie counties, Texas, in Hayward, O.T., Ed., South-central section of the Geological Society of America Centennial Field Guide, 4, p. 369-372.

Hutchinson, R.M., Jaffe, H.W., and Gottfried, D. (1954) Magmatic trends and absolute age determinations of Precambrian intrusives of central Texas (Abs.). Geological Society of American Bulletin, 65, 1266.

Hutchinson, Robert M., Kulp, J. Laurence (1964) K-Ar ages of Enchanted Rock Batholith and its metamorphic wall rocks, Llano and Mason counties, Texas, Special Paper - Geological Society of America, p. 277-278.

Johnson, Brann (1984), Downslope movement of granite slabs on anomalously low-angle slopes. Abstracts and program, Association of Engineering Geologists, 27, p. 61-62.

Johnson, Stephen A. (1974) The weathering of porphyritic leucogranite in Enchanted Rock Batholith, central Texas. Master's Thesis, University of Southern Mississippi, Hattiesburg, MS.

Keppel, David (1940) Concentric patterns in the granites of the Llano-Burnet region, Texas. Bulletin of the Geological Society of America, 51, 971-1000.

Kline, Mary-Cornelia (1960) The thorium and uranium content of the Enchanted Rock Batholith. Master's Thesis, Rice University, Houston, TX, 60 p.

McAdams, R.E. (1936a) The accessory minerals of the Wolf Mountain Granite, Llano County, Texas. M.S. thesis, Texas A&M, College Station, 13 p.

McAdams, R.E. (1936b) The accessory minerals of the Wolf Mountain Granite, Llano County, Texas. American Mineralogist, 21, 128-135.

Patchett, P.J., and Ruiz, J. (1989) Nd isotopes and the origin of Grenville-age rocks in Texas: implications for Proterozoic evolution of the United States mid-continent region. Journal of Geology, 97, 685-695.

Petersen, James F. (1988) Influence of porphyritic texture on granite weathering features; Enchanted Rock, Texas. Aplin, Graeme (compiler), 26th congress of the International Geographical Union; abstracts, Technical Program Abstracts International Geographical Congress, 26, p. 448.

Ragland, Paul C. (1962) Chemical, radiometric, and mineralogic trend surfaces within the Enchanted Rock Batholith, Llano, and Gillespie counties, Texas, Doctoral from Rice University, Houston, TX, United States, p. 80.

Ragland, Paul C., (1970) Composition and structural state of the potassic phase in perthites as related to petrogenesis of granitic pluton, Lithos, 3 (2), p. 167-189.

Ragland, Paul C., Billings, Gale K. (1965) Composition of minerals within the wall rocks of a granitic batholith, Southeastern Geology, 6 (2), p. 87-115.

Ragland, P.C., Billings, G.K., and Adams, J.A.S. (1967) Chemical fractionation and its relationship to the distribution of Th and U in a zoned granite batholith. Geochemica et Cosmochemica Acta, 31, 17 33.

Ragland, Paul C., Billings, Gale K., Adams, John A. S. (1968) Magmatic differentiation and autometasomatism in a zoned granitic batholith from central Texas, U.S.A. in Ahrens, L. H. (editor), Origin and distribution of the elements, Oxford, England, and New York, Pergamon Press (Internat. Ser. Mons. Earth Sci., 30), p. 795-823.

Smith, Diane and Wark, A. (1992) Magmatic enclaves in the Enchanted Rock Batholith, Llano Uplift, Texas. Geological Society of America Abstracts with Programs, 24, 1, 47.

Smith, Diane; Barnes, C.G., and Shannon, W.M. (1996). Mid Proterozoic Granites in Texas. Geological Society of America Abstracts with Programs 28, 1, 63.

Smith, Diane, Barnes, C.G., Shannon, W.M., Roback, Robert C., and James, Eric (1997) Petrogenesis of Mid-Proterozoic granitic magmas: examples from central and west Texas. Geological Society of America Abstracts with Programs 28, 1, 63.

Smith, Diane, Barnes, C.G., Shannon, William, Roback, R.C., and James, Eric (1997) Petrogenesis of Mid-Proterozoic granitic magmas; examples from central and West Texas. Precambrian Research, 85 1-2, p. 53-79.

Walker, N. (1992) Middle Proterozoic geologic evolution of the Llano uplift, Texas: Evidence from U-Pb zircon geochronometry. Geological Society of America Bulletin, 104, 494-504.

Winkler, E. M. (1984) Buttressed expansion of granite and development of grus in central Texas; discussion. Zeitschrift fuer Geomorphologie, 28 (3), p. 383-384.