Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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