Cita APA (7th ed.)

WHALEY, W. G. (1964). Principles of biology.-- 3rd ed. Harper and Row.

Cita Chicago (17th ed.)

WHALEY, W. Gordon. Principles of Biology.-- 3rd Ed. New York: Harper and Row, 1964.

Cita MLA (9th ed.)

WHALEY, W. Gordon. Principles of Biology.-- 3rd Ed. Harper and Row, 1964.