APA Edition Citation

Das, P. N. (1990). Introduction to manual telephony (5th ed.). Modern Book Agency.

Chicago Edition Citation

Das, P. N. Introduction to Manual Telephony. 5th ed. Calcutta: Modern Book Agency, 1990.

MLA Edition Citation

Das, P. N. Introduction to Manual Telephony. 5th ed. Modern Book Agency, 1990.

Warning: These citations may not always be 100% accurate.