APA (7th ed.) Citation

Saaty, T. L., & Kainen, P. C. (1986). The four-color problem: Assaults and conquest (1. publ.). Dover Publ.

Chicago Style (17th ed.) Citation

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. 1. publ. New York: Dover Publ, 1986.

MLA (9th ed.) Citation

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. 1. publ. Dover Publ, 1986.