APA-referens (7:e uppl.)

Tiwari , S. (2007). Global warming and its effects on environment. Adhyayan.

Chicago-referens (17:e uppl.)

Tiwari , Somnath. Global Warming and Its Effects on Environment. New Delhi: Adhyayan, 2007.

MLA-referens (9:e uppl.)

Tiwari , Somnath. Global Warming and Its Effects on Environment. Adhyayan, 2007.