APA استشهاد

Tyagi, A., & Singh , V. (2013). UGC NET/SET environmental science. Danika Publishing Company.

استشهاد بنمط شيكاغو

Tyagi, Anil, و Virendra Singh. UGC NET/SET Environmental Science. New Delhi: Danika Publishing Company, 2013.

MLA استشهاد

Tyagi, Anil, و Virendra Singh. UGC NET/SET Environmental Science. Danika Publishing Company, 2013.