I had a little bit of help...

Black, Ran. “Australian Marsupials.” Aussie Creatures. 6 February 2007. 3 April 2007.
<http://www.idilium.com/Australian_Wildlife/furry.html>.

“Diprotodontia.” Seach.com. 3 April 2007.
<http://www.search.com/reference/Diprotodontia>.

Gifford, A., et al. "Gestational length in the koala, Phascolarctos cinereus." Animal Reproduction Science 70.3/4 (2002): 261. Academic Search Premier. 25 March 2007. <http://search.ebscohost.com>.

Hunter, Liz. “Koalas.” Koala. 11 April 2007. 19 April 2007.
<http://www.thekoala.com/koala/>.

Index of /documents/community/.  24 March 2007.       <http://www.herveybay.qld.gov.au/documents/community/>.

J.A. "Cut out cuddling?." Environment 36.2 (1994): 22. Academic Search Premier. 25 March 2007. <http://search.ebscohost.com>.

“Koala.” Animal Bytes. 24 April 2007.  SeaWorld/Busch Gardens.  3 April 2007.
<http://www.swbg-adventurecamps.com/animal-info/animal-bytes/animalia/eumetazoa/coelomates/deuterostomes/chordata/craniata/mammalia/diprotodontia/koala.htm>.

“Koala.”  EBSCO Animals.  25 March 2007.  <http://search.ebscohost.com>.

“Koala Facts.” Koala Express. 24 March 2007.
<http://www.koalaexpress.com.au/facts1.htm>.

Krockenberger, A. "Meeting the energy demands of reproduction in female koalas, Phascolarctos cinereus: evidence for energetic compensation." Journal of Comparative Physiology B: Biochemical, Systemic, & Environmental Physiology 173.6 (2003): 531-540. Academic Search Premier. 25 March 2007. <http://search.ebscohost.com>.

“Learn about Koalas.” Australian Koala Foundation. 24 April 2007. 3 April 2007.
<https://www.savethekoala.com/koalas.html>.

Lee, Anthony, and Roger Martin. The Koala a Natural History. Kensington, New South Wales: New South Wales UP, 1988.

Logan, M. "Effect Of Tooth Wear on the Rumination-like Behavior, or Merycism, of Free-Ranging Koalas (Phascolarctos cinereus)." Journal of Mammalogy 84.3 (2003): 897. Academic Search Premier. 25 March 2007. <http://search.ebscohost.com>.

Moore, Ben D., and William J. Foley. "Tree use by koalas in a chemically complex landscape." Nature 435.7041 (2005): 488-490. Academic Search Premier. 24 March 2007. <http://search.ebscohost.com>.

“Redcliffe Wildlife.” Recliffe City Council. 3 April 2007.
<http://www.redcliffe.qld.gov.au/WILDLIFE.HTM>.

Schaller, Nan and Walter Bankes. "Nan and Walt's 1999 - 2000 Sabbatical
Report #10, May 10, 2000 - Part IIa.2: The Perth Zoo." Nan Schaller and Walter Bankes
1999 - 2000 Sabbatical Schedule and Reports. 10 May 2000. Rochester Institute of Technology. 3 April 2007.
<http://www.cs.rit.edu/~ncs/Australia/Animals/zoo/index.html>.

Tyndale-Biscoe, Hugh. Life of Marsupials. New York: American Elsevier Company, Inc., 1973.

*I would especially like to thank Nan Schaller and Walter Bankes, Ran Black, and Australian Koala Foundation for allowing me to use their images.*