Dyfyniad APA

Lewicki, R. J., & Barry, B. (2011). Essentials of negotiation. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Lewicki, Roy J., và Bruce Barry. Essentials of Negotiation. New York: McGraw-Hill, 2011.

Dyfyniad MLA

Lewicki, Roy J., và Bruce Barry. Essentials of Negotiation. New York: McGraw-Hill, 2011.

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