Gaya APA

Stidworthy, J., Swanson, C, P. (NULL). Encyclopedia of science plants and animals 5 . New: New York: Macmillan; 1991.

Gaya MLA

Stidworthy, John., Swanson, Carl, P.. "Encyclopedia of science plants and animals 5". New: New York: Macmillan; 1991, NULL. Text.