APA (7th ed.) Citation

Fisher, R., & Ury, W. (1991). Getting to yes: Negotiating agreement without giving in. Penguin books.

Chicago Style (17th ed.) Citation

Fisher, Roger, and William Ury. Getting to Yes: Negotiating Agreement Without Giving in. England: Penguin books, 1991.

MLA (9th ed.) Citation

Fisher, Roger, and William Ury. Getting to Yes: Negotiating Agreement Without Giving in. Penguin books, 1991.