Singh, M. (1989). Environmental changes and development. Chaugh.
Chicago-čujuhus (17. p.)Singh, M. Environmental Changes and Development. Allahabad: Chaugh, 1989.
MLA-čujuhus (9. p.)Singh, M. Environmental Changes and Development. Chaugh, 1989.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.