Karl, W. D. (1977). Eco - social systems and eco - politics. Paris.
シカゴスタイル引用形Karl, W. Devtsch. Eco - Social Systems and Eco - Politics. United nations educational scientific and cultural organization: Paris, 1977.
MLA引用形式Karl, W. Devtsch. Eco - Social Systems and Eco - Politics. Paris, 1977.
警告: この引用は必ずしも正確ではありません.