Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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