एपीए उद्धरण

Khanna K K. Economic and commercial Geography (7 th ed.). Sultan Chand & Sons.

शिकागो स्टाइल उद्धरण

Khanna K K. Economic and Commercial Geography. 7 th ed. New Delhi: Sultan Chand & Sons.

एमएलए उद्धरण

Khanna K K. Economic and Commercial Geography. 7 th ed. Sultan Chand & Sons.