APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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