Cita APA (7a ed.)

Siebert, F. S., Peterson, T., & Schramm, W. (1972). Four theories of the press (7th ed.). University of Illinois.

Cita Chicago Style (17a ed.)

Siebert, Fredrick Seaton, Theodore Peterson, y Wilbur Schramm. Four Theories of the Press. 7th ed. Urbana: University of Illinois, 1972.

Cita MLA (9a ed.)

Siebert, Fredrick Seaton, et al. Four Theories of the Press. 7th ed. University of Illinois, 1972.