Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.