(1999). Human development report 1999. UNDP.
Dyfyniad Arddull ChicagoHuman Development Report 1999. New York: UNDP, 1999.
Dyfyniad MLAHuman Development Report 1999. UNDP, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1999). Human development report 1999. UNDP.
Dyfyniad Arddull ChicagoHuman Development Report 1999. New York: UNDP, 1999.
Dyfyniad MLAHuman Development Report 1999. UNDP, 1999.