Dyfyniad APA

Roddy, D., & Coolen, J. (1989). Electronic communications (3rd ed.). Prentice-Hall of India.

Dyfyniad Arddull Chicago

Roddy, Dennis, and John Coolen. Electronic Communications. 3rd ed. New Delhi: Prentice-Hall of India, 1989.

Dyfyniad MLA

Roddy, Dennis, and John Coolen. Electronic Communications. 3rd ed. Prentice-Hall of India, 1989.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.