APA
Whitaker J. O., National Audubon Society, . (1996). National Audubon Society field guide to North American mammals. New York: Knopf.
Chicago
Whitaker John O, National Audubon Society, . 1996. National Audubon Society field guide to North American mammals. New York: Knopf.
Harvard
Whitaker J. O., National Audubon Society, . (1996). National Audubon Society field guide to North American mammals. New York: Knopf.
MLA
Whitaker John O, National Audubon Society, . National Audubon Society field guide to North American mammals. New York: Knopf. 1996.