book: Kripalu Yoga: A Guide to Practice On and Off the Mat by Richard Faulds and other senior Kripalu yoga teachers
book: Heart of Yoga by Desikachar
book: Yoga of Heart: The Healing Power of Intimate Connection by Mark Whitwell
book: The Promise of Love, Sex and Intimacy by Mark Whitwell
app: iPromise App by Mark Whitwell
Additional (short-list) reference texts include:
Asana, Pranayama, Mudra, Bandha by Bihar Publications Trust, Light on Yoga by B.K.S. Iyengar and Anatomy of Hatha Yoga by H. David Coulter.
book: Taller, Slimmer, Younger by Lauren Roxburgh. I have added this book with my students
who cross-train in mind. It's great for a home practice of foam rolling and fascial release.