Threlkeld, S. (2006). Laboratory manual for principles of biology II: Biology 104 (3rd edition.). McGraw-Hill Custom Pub.
Chicago-referens (17:e uppl.)Threlkeld, Steven. Laboratory Manual for Principles of Biology II: Biology 104. 3rd edition. Boston: McGraw-Hill Custom Pub, 2006.
MLA-referens (9:e uppl.)Threlkeld, Steven. Laboratory Manual for Principles of Biology II: Biology 104. 3rd edition. McGraw-Hill Custom Pub, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.