APA (7th ed.) Citation

United States. Bureau of Agricultural Engineering. (1935). Barrel and disk seed scarifiers. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Agricultural Engineering. Barrel and Disk Seed Scarifiers. [Washington]: [s.n.], 1935.

MLA (9th ed.) Citation

United States. Bureau of Agricultural Engineering. Barrel and Disk Seed Scarifiers. [s.n.], 1935.

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