APA (7th ed.) Citation

United States. Bureau of Plant Industry. (1942). Day length and crop yields. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Plant Industry. Day Length and Crop Yields. [Washington]: [s.n.], 1942.

MLA (9th ed.) Citation

United States. Bureau of Plant Industry. Day Length and Crop Yields. [s.n.], 1942.

Warning: These citations may not always be 100% accurate.