Citace podle APA (7th ed.)

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

Citace podle Chicago (17th ed.)

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

Citace podle MLA (9th ed.)

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

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