Tohutoro APA (7th ed.)

Biswas, N. N. (1993). Principles of telegraphy.

Tohutoru Kātū Chicago (17th ed.)

Biswas, Nripendra N. Principles of Telegraphy. New Delhi : Media promoters & Publishers, 1993.

Tohutoro MLA (9th ed.)

Biswas, Nripendra N. Principles of Telegraphy. 1993.