Singh, M. (1989). Environmental changes and development. Chaugh.
Lua i Stíl Chicago (17ú heag.)Singh, M. Environmental Changes and Development. Allahabad: Chaugh, 1989.
Lua MLA (9ú heag.)Singh, M. Environmental Changes and Development. Chaugh, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.