The Earth Works Group. (1989). 50 simple things you can do to save the earth. Berkeley, CA: Earthworks Press.
シカゴスタイル引用形The Earth Works Group. 50 Simple Things You Can Do to Save the Earth. Berkeley, CA: Earthworks Press, 1989.
MLA引用形式The Earth Works Group. 50 Simple Things You Can Do to Save the Earth. Berkeley, CA: Earthworks Press, 1989.
警告: この引用は必ずしも正確ではありません.