Lafferty, P. (1989). Communications. Marshall Cavendish.
Cita Chicago (17th ed.)Lafferty, Peter. Communications. New York: Marshall Cavendish, 1989.
Cita MLA (9th ed.)Lafferty, Peter. Communications. Marshall Cavendish, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.