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  1. 1
    by Appel, Kenneth I., 1932-
    Published 1989
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    Every planar map is four colorable /
  2. 2
    by Ore, Oystein, 1899-1968
    Published 1967
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    The four-color problem /
  3. 3
    by Saaty, Thomas L.
    Published 1977
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    The four-color problem : assaults and conquest /
  4. 4
    by Wilson, Robin J.
    Published 2003
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    Four colours suffice : how the map problem was solved /

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