Sarah. Lawmakers Scrounge Up Bus Money for Rural School Districts. IowaPublicRadio. 2015-02-03 [2018-06-18]. (原始内容存档于2018-06-17). Bellevue school board
Case of National PublicRadio (Praeger, 1999) online (页面存档备份,存于互联网档案馆) Ray William B. FCC: The Ups and Downs of Radio-TV Regulation (Iowa State University