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- Biology 121: Human Biology. University of Virginia. http://wsrv.clas.virginia.edu/~rjh9u/humbiol.html.
- BIOL 1060 - Amoebas to Zebras: The Diversity of Life on Earth. Charles G. Messing. Nova Southeastern University. http://www.nova.edu/ocean/biol1060/lecturelist.html.
- Microbiology Textbook. Timothy Paustian. University of Wisconsin, Madison. http://www.bact.wisc.edu/microtextbook/index.html. 2002.
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- BioImages: The Virtual Field-Guide (UK). Philip Greenspun. http://www.bioimages.org.uk/.
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