Attenborough, D. The Living Planet. Boston: Little Brown, and Co., 1984.

Brown, Lauren. Grasslands, The Audubon Society Nature Guides. New York: Alfred A. Knopt, Inc., 1985.

Hare, Tony (ed.). Habitats. New York: Macmillan, 1994.

Naar, Jon and Alex J. Naar. This Land is Your Land. New York: Harper Collins Publishers, Inc., 1993.