Cita APA (7a ed.)

Black, S. (1978). Practical public relations (4th.). Pitman.

Cita Chicago Style (17a ed.)

Black, Sam. Practical Public Relations. 4th. London: Pitman, 1978.

Cita MLA (9a ed.)

Black, Sam. Practical Public Relations. 4th. Pitman, 1978.