APA (7th ed.) Citation

Fritsch, R., & Fritsch, G. (1998). The Four-Color Theorem: History, Topological Foundations, and Idea of Proof. Springer New York.

Chicago Style (17th ed.) Citation

Fritsch, Rudolf, and Gerda Fritsch. The Four-Color Theorem: History, Topological Foundations, and Idea of Proof. New York, NY: Springer New York, 1998.

MLA (9th ed.) Citation

Fritsch, Rudolf, and Gerda Fritsch. The Four-Color Theorem: History, Topological Foundations, and Idea of Proof. Springer New York, 1998.