Quantum Physics: Berkeley Physics Course. Vol. 4 – Eyvind H. Wichmann – 4th Edition

This classic text is widely considered to be the best overall introductory text book on the subject . It has a complete and integrated coverage suitable for someone who wants to understand the underlying concepts of the subject.

The Berkeley Physics Course is a series of physics textbooks written mostly by UC Berkeley professors. The series consists of the following five volumes, each of which was originally used over the course of one semester at Berkeley.