Cita APA

Saaty, T. L., & Kainen, P. C. (1977). The four-color problem: Assaults and conquest. McGraw-Hill International.

Citación estilo Chicago

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. New York: McGraw-Hill International, 1977.

Cita MLA

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. New York: McGraw-Hill International, 1977.