A radio handbook for extension workers

MLA

United States. A radio handbook for extension workers. [Washington] : Office of Information & Extension Service, U.S. Dept. of Agriculture, 1939 [that is, 1941]

APA

United States. (1941). A radio handbook for extension workers. [Washington] : Office of Information & Extension Service, U.S. Dept. of Agriculture.

Chicago

United States. A radio handbook for extension workers. [Washington] : Office of Information & Extension Service, U.S. Dept. of Agriculture, 1939 [that is, 1941]