Eckholm, E. P. (1982). Down to earth: Environment and human needs. Affiliated East-West Press.
シカゴスタイル引用形Eckholm, Erik P. Down to Earth: Environment and Human Needs. New Delhi: Affiliated East-West Press, 1982.
MLA引用形式Eckholm, Erik P. Down to Earth: Environment and Human Needs. Affiliated East-West Press, 1982.
警告: この引用は必ずしも正確ではありません.