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1.	Image from Amazon.com	The Four-color theorem : History, topological foundations and idea of proof / Rudolf Fritsch and Gerda Fritsch by Fritsch, Rudolf Fritsch, Gerda Peschke, Julie [Tr.] Material type: Text Publication details: New York Springer-Verlag 1998 Availability: Items available for loan: IGIDR (1)Collection, call number: 511.5 FRI. Found in Open Library: Place hold Save to lists
2.	Image from Amazon.com	Graphs, colourings and the four-colour theorem by Wilson, Robert A Material type: Text Publication details: Oxford Oxford Uni Pr 2002 Availability: Items available for loan: IGIDR (1)Collection, call number: 511.5/WIL. Found in Open Library: Place hold Save to lists
3.	Image from Amazon.com	Four colors suffice: How the map problem was solved by Wilson, Robin Material type: Text Publication details: Princeton Princeton Uni Pr 2014 Availability: Items available for loan: IGIDR (1)Collection, call number: 511.5/WIL. Found in Open Library: Place hold Save to lists