APA Edition Citation

Fritsch, R., & Fritsch. (1998). Four colour theorems: History topological foundations and idea of proof. spinger.

Chicago Edition Citation

Fritsch, Rudolf, and Fritsch. Four Colour Theorems: History Topological Foundations and Idea of Proof. spinger, 1998.

MLA Edition Citation

Fritsch, Rudolf, and Fritsch. Four Colour Theorems: History Topological Foundations and Idea of Proof. spinger, 1998.

Warning: These citations may not always be 100% accurate.