APA (7th ed.) Citation

Roy, M. N. (1940). From savagery to civilisation. Digest Book House.

Chicago Style (17th ed.) Citation

Roy, M. N. From Savagery to Civilisation. Calcutta: Digest Book House, 1940.

MLA (8th ed.) Citation

Roy, M. N. From Savagery to Civilisation. Digest Book House, 1940.