APA (7th ed.) Citation

Siebert, F. S. (1956). Four theories of the press. University of Illinois Press.

Chicago Style (17th ed.) Citation

Siebert, Fred S. Four Theories of the Press. [Place of publication not identified]: University of Illinois Press, 1956.

MLA (9th ed.) Citation

Siebert, Fred S. Four Theories of the Press. University of Illinois Press, 1956.