P. J. O'Rourke (2007). “All the Trouble in the World: The Lighter Side of Overpopulation, Famine, Ecological Disaster, Ethnic Hatred, Plague, and Poverty”, p.86, Grove/Atlantic, Inc.
William Shakespeare, Thomas Dolby (1872). “Dictionary of Shakespearian Quotations: Exhibiting the Most Forcible Passages, Illustrative of the Various Passions, Affections and Emotions of the Human Mind”, p.148