APA (7th ed.) Citation

United States. Department of Commerce. (1930). Radio markets of world, 1930. GPO.

Chicago Style (17th ed.) Citation

United States. Department of Commerce. Radio Markets of World, 1930. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. Department of Commerce. Radio Markets of World, 1930. GPO, 1930.

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