Biswas, N. (2000). Principles of Telephony. Radient Books.
Tohutoru Kātū Chicago (17th ed.)Biswas, N.N. Principles of Telephony. India: Radient Books, 2000.
Tohutoro MLA (9th ed.)Biswas, N.N. Principles of Telephony. Radient Books, 2000.
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