Raja Yoga - Sri Swami Sivananda expounds on the philosophy of Yoga, the Sutras of Patanjali, and other aspects of Raja Yoga. - http://www.sivanandadlshq.org/teachings/rajayoga.htm
Raja Yoga of Shri Ramchadraji - Based on the philosophy and practice of Raja yoga as modified by Sri Ramchandraji Maharaj of Shajahanpur. - http://www.sriramchandra.org/