Cita APA (7th ed.)

Edgar, B. (1997). PC telephony (4th exp. ed.). Flatiron.

Cita Chicago (17th ed.)

Edgar, Bob. PC Telephony. 4th exp. ed. New York: Flatiron, 1997.

Cita MLA (9th ed.)

Edgar, Bob. PC Telephony. 4th exp. ed. Flatiron, 1997.