Cita APA (7th ed.)

Siebert, f. S. (1956). Four theories of the press: The authoriatarian, libertarian, social responsibility, and Soviet communist concepts of what the press should be and do. University of Illinois Press.

Cita Chicago (17th ed.)

Siebert, frederick Seaton. Four Theories of the Press: The Authoriatarian, Libertarian, Social Responsibility, and Soviet Communist Concepts of What the Press Should Be and Do. Urbana: University of Illinois Press, 1956.

Cita MLA (9th ed.)

Siebert, frederick Seaton. Four Theories of the Press: The Authoriatarian, Libertarian, Social Responsibility, and Soviet Communist Concepts of What the Press Should Be and Do. University of Illinois Press, 1956.