Agarwal, S. (1991). Pollution ecology. Himanshu.
Lua i Stíl Chicago (17ú heag.)Agarwal, S. Pollution Ecology. Udaipur: Himanshu, 1991.
Lua MLA (9ú heag.)Agarwal, S. Pollution Ecology. Himanshu, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.