APA (7th ed.) Citation

United States. Bureau of Plant Industry. (1941). Harvesting pyrethrum. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Plant Industry. Harvesting Pyrethrum. [Washington]: [s.n.], 1941.

MLA (9th ed.) Citation

United States. Bureau of Plant Industry. Harvesting Pyrethrum. [s.n.], 1941.

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