Stretching with Quality shows, through illustrative pictures and instructive wording, how to execute the exercises. The techniques described can achieve a stretch of the intended muscle/muscle group without involving surrounding ligaments and stretching them to extremes. This is of great importance for the lower back, which can easily cause pain when being stretched in an incorrect way.
Available at Amazon.com: http://amzn.com/B00GS7Y9CO
It is also available on iBooks.