Wilson, R. J. (2002). Four colours suffice: How the map problem was solved. Penguin Books.
Chicago Style (17th ed.) CitationWilson, Robin J. Four Colours Suffice: How the Map Problem Was Solved. London: Penguin Books, 2002.
MLA (8th ed.) CitationWilson, Robin J. Four Colours Suffice: How the Map Problem Was Solved. Penguin Books, 2002.
Warning: These citations may not always be 100% accurate.
