B.K.S. Iyengar Quotes about Attitude
B.K.S Iyengar (2000). “Astadala Yogamala Volume-1”, p.76, Allied Publishers
"The Energetic Anatomy of a Yogi: Healing the Emotional and Mental Body Through Yoga". Book by Paul G. Balch, Jaylee Balch, p. 23, 2013.