Dyfyniad APA
Hearn, P. (1979). Successful negotiation of commercial contracts. Oyez.
Dyfyniad Arddull Chicago
Hearn, Patrick. Successful Negotiation of Commercial Contracts. London: Oyez, 1979.
Dyfyniad MLA
Hearn, Patrick. Successful Negotiation of Commercial Contracts. Oyez, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.