(Earth Works Group (U.S. (1989). 50 simple things you can do to save the earth. Earthworks Press.
Style de citation Chicago (17e éd.)(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. .Berkeley, CA: Earthworks Press, 1989.
Style de citation MLA (9e éd.)(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. Earthworks Press, 1989.
Attention : ces citations peuvent ne pas être correctes à 100%.