Guy L. Beck (1993). Sonic Theology: Hinduism and Sacred Sound. University of South Carolina Press. pp. 102–103. ISBN978-0-87249-855-6., Quote: "The Gheranda Samhita, Siva Samhita and Hatha Yoga Pradipika are three of the most important Hatha Yoga texts and are intimately connected with the practice of Nada Yoga as propounded by Gorakhshanath and his school."