United States. Bureau of Biological Survey. (1939). Natural plantings for attracting waterfowl to marsh and other water areas. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Biological Survey. Natural Plantings for Attracting Waterfowl to Marsh and Other Water Areas. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Bureau of Biological Survey. Natural Plantings for Attracting Waterfowl to Marsh and Other Water Areas. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.