APA (7th ed.) Citation

United States. Bureau of Plant Industry. (1939). Blue mold (downy mildew) disease of tobacco. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Plant Industry. Blue Mold (downy Mildew) Disease of Tobacco. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Plant Industry. Blue Mold (downy Mildew) Disease of Tobacco. [s.n.], 1939.