APA (7th ed.) Citation

Gerking, S. D. (1969). Biological systems. Saunders.

Chicago Style (17th ed.) Citation

Gerking, Shelby Delos. Biological Systems. Philadelphia: Saunders, 1969.

MLA (9th ed.) Citation

Gerking, Shelby Delos. Biological Systems. Saunders, 1969.

Warning: These citations may not always be 100% accurate.