APA

Stephens G. C., North B. B., . (1974). Biology. New York: John Wiley & Sons.

Chicago

Stephens Grover C, North Barbara Best, . 1974. Biology. New York: John Wiley & Sons.

Harvard

Stephens G. C., North B. B., . (1974). Biology. New York: John Wiley & Sons.

MLA

Stephens Grover C, North Barbara Best, . Biology. New York: John Wiley & Sons. 1974.