Hartshorn, G. G. (1991). Audience research sourcebook. National Association of Broadcasters.
Cita Chicago Style (17a ed.)Hartshorn, Gerald G. Audience Research Sourcebook. Washington: National Association of Broadcasters, 1991.
Cita MLA (9a ed.)Hartshorn, Gerald G. Audience Research Sourcebook. National Association of Broadcasters, 1991.
Precaución: Estas citas no son 100% exactas.