Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
United States. Federal Radio Commission,"Commercial radio advertising : letter from the chairman of the Federal Radio Commission, transmitting in response to Senate Resolution no. 129, a report relative to the use of radio facilities for commercial-advertising purposes, together with a list showing the educational institutions which have been licensed",,U.S. Government Printing Office,1932,Document,,,,https://cir.nii.ac.jp/crid/1130282270672427264