APA (7th ed.) Citation

Turk, J. (1989). Introduction to environmental studies (3. ed.). Saunders.

Chicago Style (17th ed.) Citation

Turk, Jon. Introduction to Environmental Studies. 3. ed. Philadelphia, Pa. u. a: Saunders, 1989.

MLA (9th ed.) Citation

Turk, Jon. Introduction to Environmental Studies. 3. ed. Saunders, 1989.