• Can lifestyle changes reverse coronary heart disease? The Lifestyle Heart Trial. U.S. National Library of Medicine; PubMed.
• Yoga Nidra: A Meditative Practice for Deep Relaxation and Healing (with CD) by Richard Miller, Ph.D
• International Journal of Yoga Therapy. The International Journal of Yoga Therapy (IJYT) is an annual, peer-reviewed journal serving Yoga practitioners, Yoga teachers, Yoga therapists, health professionals, and Yoga researchers. We publish scholarly and research-based submissions related to any tradition or aspect of Yoga therapy. An electronic Supplement provides abstracts from IAYT’s Symposium on Yoga Therapy and Research (SYTAR).
• The Yoga Sutras of Patanjali. Indian scripture and foundational text of Yoga. It forms part of the body of Sutra literature dating to India’s Mauryan period. In Hindu philosophy, Yoga (also Raja Yoga to distinguish it from later schools) is the name of one of the six orthodox philosophical schools. Though brief, the Yoga Sutras are an enormously influential work on yoga philosophy and practice
• Light on Yoga: Yoga Dipika by B.K.S. Iyengar. The definitive guide to the philosophy and practice of Yoga–the ancient healing discipline for body and mind–by its greatest living teacher. Light on Yoga provides complete descriptions and illustrations of all the positions and breathing exercises.
• The Hatha Yoga Pradipika (Sanskrit: Haṭhayoga Pradīpikā, हठ योग प्रदीपिका) is a classic Sanskrit manual on hatha yoga, written by Swami Svatmarama, a disciple of Swami Gorakhnath. Said to be the oldest surviving text on the hatha yoga, it is one of the three classic texts of hatha yoga, the other two being the Gheranda Samhita and the Shiva Samhita.

  The text was written in 15th century CE. The work is derived from older Sanskrit texts and Swami Svatamarama’s own yogic experiences. Many modern English translations of the text are available.

To honor his teacher, Dr. Copeland shares the following references taken directly from his studies and personal encounters with Shri T. Krishnamacharya on the most authoritative sources of information found on yoga:

1. Ahirbudhnya Samhita: Oldest authority, written in the form of a question answer dialog.

2. Yoga Sutras of Patanjali: Commentary by Vyasa.

3. Yogayajnavalkya Samhita is a classical treatise on Yoga attributed to Yajnavalkya. It takes the form of a dialogue between Yajnavalkya and Gargi, a renowned female philosopher of his time. Contains 12 chapters and deals especially with women. Author was a native of Darabanga.

4. Yoga Rahasya: Author is Nathamuni – 12 chapters. The author was a native of Tanjore. An important text on Yoga that was lost for many centuries. The revival of this text by T Krishnamacharya, brings to life the great Yoga teachings of Nathamuni, a ninth-century Yogi and Vaisnavite saint. Important concepts presented in this text include – importance of Yoga for Women, Yoga practices to be done during pregnancy, adaptation of Yoga to suit individuals in different stages of life and Yoga as a key tool in therapy.

5. Hatha Yoga Pradipika: Author Svatmarama Suri.

6. Gheradnha Samhita: meaning “Gheranda’s collection” is one of the three classic texts of hatha yoga (the other two being the Hatha Yoga Pradipika and the Shiva Samhita). It is a late 17th century text and is considered to be the most encyclopedic of the three classic texts on hatha yoga.

7. Shandilya Samhita: Pancharatra Agama text

8. Upanishads: philosophical texts considered to be an early source of Hindu religion