Apostol, Tom M. An introduction to the theory of numbers. (Review of Hardy & Wright.) Mathematical Reviews (MathSciNet) MR0568909. American Mathematical Society. n.d. [2013-05-06]. (原始内容存档于2012-07-31).
Apostol, Tom M. An introduction to the theory of numbers. (Review of Hardy & Wright.) Mathematical Reviews (MathSciNet) MR0568909. American Mathematical Society. n.d. [2013-05-06]. (原始内容存档于2012-07-31).