APA استشهاد

Tyagi, A., & Singh, V. (2014). Trueman's specific series UGC NET/SET environmental science: Environmental Science. Danika.

استشهاد بنمط شيكاغو

Tyagi, Anil, و Virendra Singh. Trueman's Specific Series UGC NET/SET Environmental Science: Environmental Science. New Delhi: Danika, 2014.

MLA استشهاد

Tyagi, Anil, و Virendra Singh. Trueman's Specific Series UGC NET/SET Environmental Science: Environmental Science. Danika, 2014.