APA

Pennak R. W., . (1964). Collegiate dictionary of zoology. New York: Ronald Press Co.

Chicago

Pennak Robert W, . 1964. Collegiate dictionary of zoology. New York: Ronald Press Co.

Harvard

Pennak R. W., . (1964). Collegiate dictionary of zoology. New York: Ronald Press Co.

MLA

Pennak Robert W, . Collegiate dictionary of zoology. New York: Ronald Press Co. 1964.