APA (7th ed.) Citation

Fisher, R., Ury, W., & Patton, B. (1991). Getting to yes: Negotiating agreement without giving in (2nd ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Fisher, Roger, William Ury, and Bruce Patton. Getting to Yes: Negotiating Agreement Without Giving in. 2nd ed. New York [N.Y.] [etc.]: Penguin Books, 1991.

MLA (9th ed.) Citation

Fisher, Roger, et al. Getting to Yes: Negotiating Agreement Without Giving in. 2nd ed. Penguin Books, 1991.