Cita APA (7a ed.)

Siebert, F. S. (1956). Four Theories of the Press: The Authoritarian, Libertarian, Social Responsibility, and Soviet Communist Concepts of What the Press Should Be and Do. University of Illinois Press.

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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