Behler, John L., and Deborah A. Behler.Alligators & Crocodiles. Voyageur, 1998. Covers life history information on all 23 crocodilian species. With photographs; for general readers.
Cogger, Harold G., and others, eds.Encyclopedia of Reptiles and Amphibians. Academic, 1998. Beautifully illustrated and authoritative guide from the world's leading herpetologists.
McCarthy, Colin, and others.Reptile. Dorling Kindersley, 2000. From the popular "Eyewitness" series, an original and engaging look at reptiles. For middle-school readers.