Ury William. (1991). Getting Past No: Negotiation With difficult People. Random House Business Books.
Citazione stile Chigago Style (17a edizione)Ury William. Getting Past No: Negotiation With Difficult People. London: Random House Business Books, 1991.
Citatione MLA (9a ed.)Ury William. Getting Past No: Negotiation With Difficult People. Random House Business Books, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.