Lum, G. (2005). The negotiation fielbook: Simple strategies to help you negotiate everything. New York: McGraw-Hill.
Παραπομπή Chicago StyleLum, Grande. The Negotiation Fielbook: Simple Strategies to Help You Negotiate Everything. New York: McGraw-Hill, 2005.
Παραπομπή MLALum, Grande. The Negotiation Fielbook: Simple Strategies to Help You Negotiate Everything. New York: McGraw-Hill, 2005.
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