Anil Tyagi. (2009). Trueman's UGC NET/SLET Environmental Science. Danika publishing house.
Chicago Style aipamenaAnil Tyagi. Trueman's UGC NET/SLET Environmental Science. New Delhi: Danika publishing house, 2009.
MLA aipamenaAnil Tyagi. Trueman's UGC NET/SLET Environmental Science. Danika publishing house, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.