APA (7th ed.) Citation

United States. National Planning Board. (1940). The Northern Great Plains, May 1940. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Planning Board. The Northern Great Plains, May 1940. [Washington]: [publisher not identified], 1940.

MLA (9th ed.) Citation

United States. National Planning Board. The Northern Great Plains, May 1940. [publisher not identified], 1940.

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