Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Turk, Jonathan. Introduction to Environmental Studies. 3rd ed. Philadelphia: Saunders college, 1989.

Cita MLA (9th ed.)

Turk, Jonathan. Introduction to Environmental Studies. 3rd ed. Saunders college, 1989.