The Meditation Process: Raja Yoga and Buddhist Shamatha – Kindle edition by Olson, Lyle. Religion & Spirituality Kindle eBooks @ Amazon.com.

There are hundreds of books on raja yoga. One has to wonder (it was said by the notorious Rajneesh in one of hundreds of books that Vivekananda was blocked from enlightenment by his master Ramakhrisna!!!) at them. The stage of dharana is a steep first step, and rarely seems to register in all the hype over yoga. Here is one that is intriguing and useful.