Dyfyniad APA

Roy J Lewicki. (2001). Essentials of negotiation. Boston, MA: McGraw-Hill.

Dyfyniad Arddull Chicago

Roy J Lewicki. Essentials of Negotiation. Boston, MA: McGraw-Hill, 2001.

Dyfyniad MLA

Roy J Lewicki. Essentials of Negotiation. Boston, MA: McGraw-Hill, 2001.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.