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.
Atenció: Aquestes cites poden no estar 100% correctes.