Παραπομπή APA

Khanna, K., & Gupta, V. (1978). Economic and commercial geography/6e (6th ed.). Sultan Chand and Sons.

Παραπομπή Chicago Style

Khanna, K.K, και V.K Gupta. Economic and Commercial Geography/6e. 6th ed. New Delhi: Sultan Chand and Sons, 1978.

Παραπομπή MLA

Khanna, K.K, και V.K Gupta. Economic and Commercial Geography/6e. 6th ed. Sultan Chand and Sons, 1978.