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Duellman, William E., Schlager, Neil (2003). "Animal Life Encyclopedia: Volume 6 Amphibians". Thomson-Gale ISBN 0-7876-5782-4

The Whole Frog Project - Virtual frog dissection and anatomy

Disappearance of toads, frogs has some scientists worried - San Francisco Chronicle, April 20, 1992

Xenbase - A Xenopus laevis and tropicalis Web Resource

Time-lapse video showing the egg's development until hatching

Frog calls - short video clips of calling frogs and interviews with scientists about frog issues, including declining and malformed frog causes