J. R. Puri & T. R. Shangari: Bulleh Shah, The Love-Intoxicated Iconoclast, Radha Soami Satsang Beas, Amritsar, India, 1986

Isaac A. Ezekiel: Sarmad, Martyr to Love Divine, Radha Soami Satsang Beas Publishers, Delhi, 1st edition, 2005