1. W. W. Adams and L. J. Goldstein,Introduction to Number Theory, Prentice-Hall, Englewood Cliffs, NJ, 1976.
2. M. F. Atiyah and I. G. Macdonald,Introduction to Commutative Algebra, Addison-Wesley Publishing Co., Reading, MA, 1969.
3. The proof of the mordell conjecture
4. E. D. Bolker,Elementary Number Theory: An Algebraic Approach, W. A. Benjamin, New York, 1970.