Smith, F. (1971). Conservation in the United states: A documentary history. 5v. Van nostrand.
シカゴスタイル引用形Smith, Frank. Conservation in the United States: A Documentary History. 5v. New york: Van nostrand, 1971.
MLA引用形式Smith, Frank. Conservation in the United States: A Documentary History. 5v. Van nostrand, 1971.
警告: この引用は必ずしも正確ではありません.