Roddy, D., & Coolen, J. (1995). Electronic communications (3rd ed.). Prentice-Hall of India.
Tohutoru Kātū Chicago (17th ed.)Roddy, Dennis, me John Coolen. Electronic Communications. 3rd ed. New Delhi: Prentice-Hall of India, 1995.
Tohutoro MLA (9th ed.)Roddy, Dennis, me John Coolen. Electronic Communications. 3rd ed. Prentice-Hall of India, 1995.
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