Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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