WARD, J. A. (1980). Biology; today and tomorrow. West.
Cita Chicago (17th ed.)WARD, Jack A. Biology; Today and Tomorrow. St. Paul, Minn: West, 1980.
Cita MLA (9th ed.)WARD, Jack A. Biology; Today and Tomorrow. West, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.