Cita APA (7th ed.)

Jolley, E. (1992). Introduction to telephony and telegraphy. Y.P Chopra.

Cita Chicago (17th ed.)

Jolley, E.H. Introduction to Telephony and Telegraphy. Allahabad: Y.P Chopra, 1992.

Cita MLA (9th ed.)

Jolley, E.H. Introduction to Telephony and Telegraphy. Y.P Chopra, 1992.