APA Citation

De, K. (1980). A text book on astronomy (7th ed.). Calcutta: K.Das.

Chicago Style Citation

De, K.K. A Text Book On Astronomy. 7th ed. Calcutta: K.Das, 1980.

MLA Citation

De, K.K. A Text Book On Astronomy. 7th ed. Calcutta: K.Das, 1980.

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