1. “The solution of the four-color-map problem,”;Appel;Scientific American,1977
2. “Sur la décomposition des ensembles de points en parties respectivement congruentes,”;Banach;Fundamenta Mathematicae,1924
3. The Development of Mathematics;Bell,1945
4. Mathematics: Queen and Servant of Science;Bell,1951
5. The Foundations of Mathematics;Beth,1959