APA
Jonathan Turk, . (1985). Introduction to environmental studies. Saunders Publ, Philadelphia: .
Chicago
Jonathan Turk, . 1985. Introduction to environmental studies. Saunders Publ, Philadelphia: .
Harvard
Jonathan Turk, . (1985). Introduction to environmental studies. Saunders Publ, Philadelphia: .
MLA
Jonathan Turk, . Introduction to environmental studies. Saunders Publ, Philadelphia: . 1985.