(2000). UPSC 50th Annual Report. UPSC.
Dyfyniad Arddull ChicagoUPSC 50th Annual Report. New Delhi: UPSC, 2000.
Dyfyniad MLAUPSC 50th Annual Report. UPSC, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(2000). UPSC 50th Annual Report. UPSC.
Dyfyniad Arddull ChicagoUPSC 50th Annual Report. New Delhi: UPSC, 2000.
Dyfyniad MLAUPSC 50th Annual Report. UPSC, 2000.