APA استشهاد

Khullar, D. R. (2018). Physical, human and economic geography: For civil services examination. G K Publications.

استشهاد بنمط شيكاغو

Khullar, D R. Physical, Human and Economic Geography: For Civil Services Examination. New Delhi: G K Publications, 2018.

MLA استشهاد

Khullar, D R. Physical, Human and Economic Geography: For Civil Services Examination. G K Publications, 2018.