http://www.isabellagreene.com/bio-1.html

Recommendations from Isabella Greeene: Joe Dispensa (Babaji Kriya Yoga breath technique).
Sonja Renaldi

VLA Comment: I first recommend Emanuel Swedenborg‘s book HEAVEN AND HELL (large print edition). Swedenborg (29 January 1688 – 29 March 1772)

I also recommend, foundationally and most importantly, Transcendental Meditation as taught by Maharishi Mahesh Yogi