Quadratic Number Theory : An Invitation to Algebraic Methods in the Higher Arithmetic by J.L. Lehman

This text is an introduction to algebraic number theory for readers with a moderate knowledge of elementary number theory and some familiarity with the terminology of abstract algebra. With its exceptionally clear prose, hundreds of exercises, and historical motivation, it would make an excellent textbook for a second undergraduate course in number theory or a terrific choice for independent reading.
Binding: Hardback