Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Turk, Jonathan. Introduction to Environmental Studies. New York: Saunders College, 1989.

Cita MLA (9th ed.)

Turk, Jonathan. Introduction to Environmental Studies. Saunders College, 1989.