Smith, F. (1971). Conservation in the United states: A documentary history. 5v. Van nostrand.
Chicago-stil citatSmith, Frank. Conservation in the United States: A Documentary History. 5v. New york: Van nostrand, 1971.
MLA-referensSmith, Frank. Conservation in the United States: A Documentary History. 5v. Van nostrand, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.