APA (7th ed.) Citation

United States. Bureau of Agricultural Economics. (1941). Economic aspects of farm tractor operation, selected references, 1935-Mar. 1941. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Agricultural Economics. Economic Aspects of Farm Tractor Operation, Selected References, 1935-Mar. 1941. [Washington]: [s.n.], 1941.

MLA (9th ed.) Citation

United States. Bureau of Agricultural Economics. Economic Aspects of Farm Tractor Operation, Selected References, 1935-Mar. 1941. [s.n.], 1941.