APA استشهاد

Khanna, K., & Gupta, V. (1977). Economic and commercial geography/5e (5th ed.). Sultan Chand and Sons.

استشهاد بنمط شيكاغو

Khanna, K.K, و V.K Gupta. Economic and Commercial Geography/5e. 5th ed. Delhi: Sultan Chand and Sons, 1977.

MLA استشهاد

Khanna, K.K, و V.K Gupta. Economic and Commercial Geography/5e. 5th ed. Sultan Chand and Sons, 1977.