Sylvia Boorstein, Ph.D. (2007). “Pay Attention, for Goodness' Sake: Practicing the Perfections of the Heart--The Buddhist Path of Kindness”, p.20, Ballantine Books
William Shakespeare (2013). “Making Sense of Measure for Measure! a Students Guide to Shakespeare's Play (Includes Study Guide, Biography, and Modern Retelli”, p.221, BookCaps Study Guides