APA (7th ed.) Citation

Wilson, R. J., & Stewart, B. H. I. H. (2014). Four colors suffice: How the map problem was solved (Revised color edition.). Princeton University Press.

Chicago Style (17th ed.) Citation

Wilson, Robin J., and B. H. I. H. Stewart. Four Colors Suffice: How the Map Problem Was Solved. Revised color edition. Princeton, Oxford: Princeton University Press, 2014.

MLA (9th ed.) Citation

Wilson, Robin J., and B. H. I. H. Stewart. Four Colors Suffice: How the Map Problem Was Solved. Revised color edition. Princeton University Press, 2014.