1. Duhigg, Charles. The Power of Habit. Random House, N.Y., 2012.

2. Engel, Lewis Ph.D. and Tom Ferguson M.D. Hidden Guilt. Pocket Books, N.Y., 1991.

3. Campbell, Susan Ph.D. From Triggered to Tranquil. New World Library, Novato CA, 2021.

4. Wade, Jenny Ph.D. Transcendent Sex. Simon and Schuster, N.Y., 2004.

5. Gottman, John Ph.D. The Seven Principles for Making Marriage Work. Crown Publishing, N.Y., 2008. 6 Johnson, Sue Ph.D. Hold Me Tight. Little, Brown and Co., N.Y., 2008.