Norman D. Anderson and Walter R. Brown, Lemurs. New York: Dodd, Mead & Company, 1984.

Caroline Arnold, Rhino. New York: Morrow Junior Books, 1995.

"The Call of the Wild," Time for Kids, February 7, 1997. Susan DeStefano, Theodore Roosevelt: Conservation President. New York: Twenty-First Century Books, 1993.

Jon Erickson, Dying Planet: The Extinction of Species. Blue Ridge Summit, PA: TAB Books, 1991.

Roger Few, Macmillan Children's Guide to Endangered Animals. New York: Macmillan, 1993.

Dorothy Hinshaw Patent, The Whooping Crane: A Comeback Story. New York: Clarion Books, 1988.

Science Year 1996: The World Book Annual Science Supplement. Chicago: World Book, 1995.

Sally Tolan, John Muir. Milwaukee, WI: Gareth Stevens Children's Books, 1990.

Lois Warburton, Rainforests. San Diego: Lucent Books, 1990.