APA

Gupta A., Kapoor A., . (1996). Principles of physical geography. New Delhi: S.Chand & company Ltd.

Chicago

Gupta A.Das, Kapoor A.N, . 1996. Principles of physical geography. New Delhi: S.Chand & company Ltd.

Harvard

Gupta A., Kapoor A., . (1996). Principles of physical geography. New Delhi: S.Chand & company Ltd.

MLA

Gupta A.Das, Kapoor A.N, . Principles of physical geography. New Delhi: S.Chand & company Ltd. 1996.