Quantum Theory, Groups and Representations:
An Introduction

Peter Woit

Published November 2017 by Springer.

The Springer webpage for the book is here.  The SpringerLink page is here (if your institution is a Springer subscriber, this should give you electronic access to the book, as well as the possibility to buy a $24.99 softcover version).  A web-page of errata is here.

I'm starting to revise and expand a bit the book, you can access the latest version of that revision here.

For more information, see some blog entries.

For a review of the book, see Woit's Way.