Cefry, Holly. Sedimentary Rocks. First. New York: The Rosen Publishing Co., 2003.

Cefry, Holly. Igneous Rocks. Fist. New York: The Rosen Publishing Co.,2003.

Cefry, Holly. Metamorphic Rocks. Fist. New York: The Rosen Publishing Co.,2003.

Graham, Ian. Rocks A resource our world depends on. Chicago, Illinois: Heinemann Library, 2005.

Ostopowich, Melanie. Science Matters The Rock Cycle. New York: Weigl Publishers,Inc., 2005.

Peyton, Tammy. Rock Hounds. 1999. Loogootee Community Schools. 4 Mar 2009

Squire, Ann O. Rocks and Minerals. New York.: Children's Press,2002.

Symes, Dr. R.F.. Eyewitness Rocks and Minerals. First American. New York: Alfred A. Knopf, 1988.

Amethyst Galleries Inc, "The Physical Characteristics of Minerals." Mineral Gallery. 1995-2009. Amethyst Galleries Inc.. 4 Mar 2009 <http://www.galleries.com/minerals/property/physical.htm>.

ETE Team, "Earth Floor Cycles." The Rock Cycle. April 28,2005. Wheeling Jesuit University. 4 Mar 2009 <http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html>.

Kindersley, Dorling. "Earth's Structure." Earth's Structure. Thinkquest. 6 Mar 2009 <http://mediatheek.thinkquest.nl/~ll125/en/struct.htm>.

McDougal Littell, "Igneous,Sedimentary,Metamprhic Rocks." How Rocks Change. Hougton Mifflin. 4 Mar 2009 <http://www.classzone.com/books/earth_science/terc/content/investigations/es0602/es0602page01.cfm?chapter_no=investigation>.

Mineral Information Institute, "Common Minerals and their uses." Mineral Information Institute. SME Foundation. 5 Mar 2009 <http://www.mii.org/commonminerals.php>

Peyton, Tammy. "Rock Hounds." Rockhound Home Page. 1-29-1999. Loogootee Community Schools. 4 Mar 2009 <http://sln.fi.edu/fellows/payton/rocks/index2.html>.

USGS, "USGS Geology in the Changing World." Rocks. 1-13-04. USGS. 4 Mar 2009 <http://geomaps.wr.usgs.gov/parks/rxmin/rock.html>.