APA (7th ed.) Citation

United States. Bureau of Animal Industry. (1938). Tattoo method of marking hogs and its use. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Animal Industry. Tattoo Method of Marking Hogs and Its Use. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Animal Industry. Tattoo Method of Marking Hogs and Its Use. [s.n.], 1938.