(Earth Works Group (U.S. (1989). 50 simple things you can do to save the earth. Earthworks Press.
Citación estilo Chicago(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. .Berkeley, CA: Earthworks Press, 1989.
Cita MLA(Earth Works Group (U.S. 50 Simple Things You Can Do to Save the Earth. Earthworks Press, 1989.
Warning: These citations may not always be 100% accurate.