APA (7th ed.) Zitazioa

WARD, J. A. (1980). Biology; today and tomorrow. West.

Chicago Style (17th ed.) Zitazioa

WARD, Jack A. Biology; Today and Tomorrow. St. Paul, Minn: West, 1980.

MLA (9th ed.) Zitazioa

WARD, Jack A. Biology; Today and Tomorrow. West, 1980.