Lum, G. (2005). The negotiation fielbook: Simple strategies to help you negotiate everything. New York: McGraw-Hill.
Dyfyniad Arddull ChicagoLum, Grande. The Negotiation Fielbook: Simple Strategies to Help You Negotiate Everything. New York: McGraw-Hill, 2005.
Dyfyniad MLALum, Grande. The Negotiation Fielbook: Simple Strategies to Help You Negotiate Everything. New York: McGraw-Hill, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.