National Association of Broadcasters. Legal Department. (1988). Political Broadcast Catechism (12th ed.). National Association of Broadcasters.
Cita Chicago (17th ed.)National Association of Broadcasters. Legal Department. Political Broadcast Catechism. 12th ed. Washington, D.C: National Association of Broadcasters, 1988.
Cita MLA (9th ed.)National Association of Broadcasters. Legal Department. Political Broadcast Catechism. 12th ed. National Association of Broadcasters, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.