Federal duck stamp art contest: Information, entry form and regulations. U.S. Fish and Wildlife Service, Federal Duck Stamp Office.
Chicago Style (17th ed.) CitationFederal Duck Stamp Art Contest: Information, Entry Form and Regulations. Falls Church, VA: U.S. Fish and Wildlife Service, Federal Duck Stamp Office.
MLA (9th ed.) CitationFederal Duck Stamp Art Contest: Information, Entry Form and Regulations. U.S. Fish and Wildlife Service, Federal Duck Stamp Office.
Warning: These citations may not always be 100% accurate.