Jon Kabat-Zinn (2013). “Full Catastrophe Living (Revised Edition): Using the Wisdom of Your Body and Mind to Face Stress, Pain, and Illness”, p.521, Bantam
William Shakespeare (1838). “The Pictorial edition of the works of Shakspere, ed. by C. Knight. [8 vols., including a vol. entitled William Shakspere, by C. Knight].”, p.281
Elbert Hubbard (2009). “Love, Life & Work: Being a Book of Opinions Reasonably Good-Natured Concerning How to Attain the Highest Happiness for One's Self with the Least Possible Harm to Others”, p.6, The Floating Press