United States. Bureau of Plant Industry. (1939). Weeds, how to control them. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Plant Industry. Weeds, How to Control Them. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Bureau of Plant Industry. Weeds, How to Control Them. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.