Referêcias 21.5 Referências e Leituras sugeridas
[1]
    Dean, R. A. Elements of Abstract Algebra. Wiley, New York, 1966.
[2]
    Dudley, U. A Budget of Trisections. Springer-Verlag, New York, 1987. An interesting and entertaining account of how not to  trisect an angle.
[3]
    Fraleigh, J. B. A First Course in Abstract Algebra. 7th ed. Pearson, Upper Saddle River, NJ, 2003.
[4]
    Kaplansky, I. Fields and Rings, 2nd ed. University of Chicago Press, Chicago, 1972.
[5]
    Klein, F. Famous Problems of Elementary Geometry. Chelsea, New York, 1955.
[6]
    Martin, G. Geometric Constructions. Springer, New York, 1998.
[7]
    H. Pollard and H. G. Diamond. Theory of Algebraic Numbers, Dover, Mineola, NY, 2010.
[8]
    Walker, E. A. Introduction to Abstract Algebra. Random House,  New York, 1987. This work contains a proof showing that every field has an algebraic closure.
