APA (7th ed.) Citation

United States. Armed Forces Radio Service. (1930). Amateur radio stations of U.S.; edition of June 30, 1930. GPO.

Chicago Style (17th ed.) Citation

United States. Armed Forces Radio Service. Amateur Radio Stations of U.S.; Edition of June 30, 1930. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. Armed Forces Radio Service. Amateur Radio Stations of U.S.; Edition of June 30, 1930. GPO, 1930.