APA (7th ed.) Citation

Saaty, T. L., & Kainen, P. C. (1977). The four-color problem: Assaults and conquest (1. print.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. 1. print. New York [u.a.]: McGraw-Hill, 1977.

MLA (9th ed.) Citation

Saaty, Thomas L., and Paul C. Kainen. The Four-color Problem: Assaults and Conquest. 1. print. McGraw-Hill, 1977.