Yadav, P. R. Environmental ecology. Discovery Publishing House.
Lua i Stíl Chicago (17ú heag.)Yadav, P. R. Environmental Ecology. New Delhi: Discovery Publishing House.
Lua MLA (9ú heag.)Yadav, P. R. Environmental Ecology. Discovery Publishing House.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.