Cita APA (7th ed.)
Penn, B. (2004). Be your own PR expert (2nd ed.). Thomson Learning.
Cita Chicago (17th ed.)
Penn, Bill. Be Your Own PR Expert. 2nd ed. Australia: Thomson Learning, 2004.
Cita MLA (9th ed.)
Penn, Bill. Be Your Own PR Expert. 2nd ed. Thomson Learning, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.