APA

Fisher R., Patton B. M., Ury W. & Vasco Montoya E. (1991). Getting to yes. New York: Penguin Books.

Chicago

Fisher Roger, Patton Bruce M, Ury William and Vasco Montoya Eloisa. 1991. Getting to yes. New York: Penguin Books.

Harvard

Fisher R., Patton B. M., Ury W. and Vasco Montoya E. (1991). Getting to yes. New York: Penguin Books.

MLA

Fisher Roger, Patton Bruce M, Ury William and Vasco Montoya Eloisa. Getting to yes. New York: Penguin Books. 1991.