Glenn R. Schiraldi (2007). “10 Simple Solutions for Building Self-Esteem: How to End Self-Doubt, Gain Confidence, & Create a Positive Self-Image”, p.126, New Harbinger Publications
William Shakespeare (1797). “The Poetical Works of Shakespeare. With the Life of the Author ... Embellished with Superb Engravings [including a Portrait].”, p.118