Cita APA (7th ed.)

Povey, P. J. (1979). The telephone and the exchange (Revised edition.). Pitman Publishing Limited.

Cita Chicago (17th ed.)

Povey, P. J. The Telephone and the Exchange. Revised edition. London: Pitman Publishing Limited, 1979.

Cita MLA (8th ed.)

Povey, P. J. The Telephone and the Exchange. Revised edition. Pitman Publishing Limited, 1979.