एपीए उद्धरण

Khanna, K., & Gupta, V. (1978). Economic and commercial geography. Sultanchand & Sons.

शिकागो स्टाइल उद्धरण

Khanna, K.K, और V.K Gupta. Economic and Commercial Geography. New Delhi: Sultanchand & Sons, 1978.

एमएलए उद्धरण

Khanna, K.K, और V.K Gupta. Economic and Commercial Geography. Sultanchand & Sons, 1978.