Turk, J. (1989). Introduction to environmental studies (3rd ed.). Saunders college.
Citación estilo ChicagoTurk, Jonathan. Introduction to Environmental Studies. 3rd ed. Philadelphia: Saunders college, 1989.
Cita MLATurk, Jonathan. Introduction to Environmental Studies. 3rd ed. Saunders college, 1989.
Warning: These citations may not always be 100% accurate.