1. SEIFERT, H. and THRBLFALL, W.: Lehrbuch der Topologie, Chelsea, reprint, 1947.
2. COXETER, H.S.M.: Regular polytopes, Dover, reprint, 1973.
3. KLEIN, F.: Lectures on the isocahedron and the solution of equations of the fifth degree Dover, reprint, 1956 (translated from the German).
4. BOREVICH, Z.I. and SHAFAREVICH, I.R.: Number theory, Acad. Press, 1966 (translated from the Russian).
5. BOURBAKI, N.: Elements of mathematics. Commutative algebra Addison-Wesley, 1972 (translated from the French).