एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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