APA (7th ed.) Citation

U.S. Dept. of Agriculture. (1940). Farmers in a changing world. Govt. Print. Off.

Chicago Style (17th ed.) Citation

U.S. Dept. of Agriculture. Farmers in a Changing World. [Washington]: Govt. Print. Off, 1940.

MLA (9th ed.) Citation

U.S. Dept. of Agriculture. Farmers in a Changing World. Govt. Print. Off, 1940.