Bruce, K. (1992). Telephoning (Col. ed.). Longman.
Cita Chicago (17th ed.)Bruce, Kay. Telephoning. Col. ed. London: Longman, 1992.
Cita MLA (8th ed.)Bruce, Kay. Telephoning. Col. ed. Longman, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.