(2001). UPSC 51th Annual Report. UPSC.
Dyfyniad Arddull ChicagoUPSC 51th Annual Report. New Delhi: UPSC, 2001.
Dyfyniad MLAUPSC 51th Annual Report. UPSC, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(2001). UPSC 51th Annual Report. UPSC.
Dyfyniad Arddull ChicagoUPSC 51th Annual Report. New Delhi: UPSC, 2001.
Dyfyniad MLAUPSC 51th Annual Report. UPSC, 2001.