APA
Turk J., . (1985). introduction to environmental studies. New York: Saunders college publishing.
Chicago
Turk Jonathan, . 1985. introduction to environmental studies. New York: Saunders college publishing.
Harvard
Turk J., . (1985). introduction to environmental studies. New York: Saunders college publishing.
MLA
Turk Jonathan, . introduction to environmental studies. New York: Saunders college publishing. 1985.