APA Edition Citation

Kumra, V. K., Onkar Singh, & Prithvish Nag. (1993). Frontiers in environmental geography.

Chicago Edition Citation

Kumra, V K., Onkar Singh, and Prithvish Nag. Frontiers in Environmental Geography. New Delhi, Concept Publishing Company, 1993.

MLA Edition Citation

Kumra, V K., et al. Frontiers in Environmental Geography. 1993.