APA (7e ed.) Bronvermelding

Kumra, V. K., Nag, P., & Singh, J. (1997). Geography and environment. Concept Pub.

Chicago (17e ed.) Bronvermelding

Kumra, V. K., Prithvish Nag, en Jagdish Singh. Geography and Environment. New Delhi: Concept Pub, 1997.

MLA (9e ed.) Bronvermelding

Kumra, V. K., et al. Geography and Environment. Concept Pub, 1997.