O'Brien, J. (2016). Negotiation for procurement professionals: A proven approach that puts the buyer in control (2nd edition.). Kogan Page.
Chicago-Zitierstil (17. Ausg.)O'Brien, Jonathan. Negotiation for Procurement Professionals: A Proven Approach That Puts the Buyer in Control. 2nd edition. London: Kogan Page, 2016.
MLA-Zitierstil (9. Ausg.)O'Brien, Jonathan. Negotiation for Procurement Professionals: A Proven Approach That Puts the Buyer in Control. 2nd edition. Kogan Page, 2016.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.