Παραπομπή APA

Singh, V., & Sharma, M. (1998). Mountain ecosystems: A scenario of unsustainability. Indus publishing company.

Παραπομπή Chicago Style

Singh, Vir, και M.L Sharma. Mountain Ecosystems: A Scenario of Unsustainability. New Delhi: Indus publishing company, 1998.

Παραπομπή MLA

Singh, Vir, και M.L Sharma. Mountain Ecosystems: A Scenario of Unsustainability. Indus publishing company, 1998.