Cita APA (7a ed.)
Siebert, F. S., & Peterson, T. (1956). Four theories of the press. University of Illinois Press.
Cita Chicago Style (17a ed.)
Siebert, Fred S., y Theodore Peterson. Four Theories of the Press. Urbana: University of Illinois Press, 1956.
Cita MLA (9a ed.)
Siebert, Fred S., y Theodore Peterson. Four Theories of the Press. University of Illinois Press, 1956.
Precaución: Estas citas no son 100% exactas.