United States. Department of Commerce. (1930). Radio markets of world, 1930. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Commerce. Radio Markets of World, 1930. [Washington]: GPO, 1930.
MLA (9th ed.) CitationUnited States. Department of Commerce. Radio Markets of World, 1930. GPO, 1930.
Warning: These citations may not always be 100% accurate.