(2008). Harvard Business Review 2008. HBR.
Dyfyniad Arddull ChicagoHarvard Business Review 2008. HBR, 2008.
Dyfyniad MLAHarvard Business Review 2008. HBR, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(2008). Harvard Business Review 2008. HBR.
Dyfyniad Arddull ChicagoHarvard Business Review 2008. HBR, 2008.
Dyfyniad MLAHarvard Business Review 2008. HBR, 2008.