The Yoga Aphorisms of Patanjali is a major work on the practice of yoga and meditation. Through these ancient aphorisms you will learn how to control your mind and achieve inner peace and freedom. Although these methods were taught over 2,000 years ago, they are as alive and effective today as they have ever been. The 2008 edition has been reset and now has an extensive index for reference.

The Deeper Dimension of Yoga: Theory and Practice by George Feuerstein
In this book, Georg Feuerstein demonstrates that Yoga is much more than a system of physical exercises; it is a profound path of self-transformation, encompassing