Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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