Turk, J. (1989). Introduction to environmental studies (3rd ed.). Saunders college.
芝加哥风格引文Turk, Jonathan. Introduction to Environmental Studies. 3rd ed. Philadelphia: Saunders college, 1989.
MLA引文Turk, Jonathan. Introduction to Environmental Studies. 3rd ed. Saunders college, 1989.
警告：这些引文格式不一定是100％准确.