Batra,Sanjay Kumar & others. (2015). Environmental Studies. Taxmans.
Lua i Stíl Chicago (17ú heag.)Batra,Sanjay Kumar & others. Environmental Studies. New Delhi: Taxmans, 2015.
Lua MLA (9ú heag.)Batra,Sanjay Kumar & others. Environmental Studies. Taxmans, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.