Wise Publications 
Next Step Guitar: Chords Made Easy 

Unlock the mystery of chords and harmony with this tutorial that will inform your improvising and inspire your songwriting. With this book you will quickly learn how to master common chord progressions and how to transpose them into any key using a specially devised transposition chart. 

Explore altered chords and extended or exotic harmonies in an easy-to-understand way, and develop you own extensive vocabulary of open, bar and 'Jazz' chord formulations. 
A CD of superb crystal-clear recordings supports each lesson.