United States. Bureau of Biological Survey. (1918). Proposed amendments of regulations of Aug. 21, 1916, as amended Oct. 10, 1917, for protection of migratory birds. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Biological Survey. Proposed Amendments of Regulations of Aug. 21, 1916, as Amended Oct. 10, 1917, for Protection of Migratory Birds. [Washington]: GPO, 1918.
MLA (9th ed.) CitationUnited States. Bureau of Biological Survey. Proposed Amendments of Regulations of Aug. 21, 1916, as Amended Oct. 10, 1917, for Protection of Migratory Birds. GPO, 1918.
Warning: These citations may not always be 100% accurate.