APA aipamena

Tyagi, A., & Sing, V. UGC NET/SET environment science. Danika.

Chicago Style aipamena

Tyagi, Anil, and Virendra Sing. UGC NET/SET Environment Science. 2011: Danika.

MLA aipamena

Tyagi, Anil, and Virendra Sing. UGC NET/SET Environment Science. Danika.