APA引文

(Earth Works Group (U.S. (1989). 50 simple things you can do to save the earth. Earthworks Press.

芝加哥风格引文

(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. .Berkeley, CA: Earthworks Press, 1989.

MLA引文

(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. Earthworks Press, 1989.

警告：这些引文格式不一定是100％准确.