Philippa Gregory (2011). “Philippa Gregory's Tudor Court 6-Book Boxed Set: The Constant Princess, The Other Boleyn Girl, The Boleyn Inheritance, The Queen's Fool, The Virgin's Lover, and The Other Queen”, p.90, Simon and Schuster
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.41, Skyhorse Publishing, Inc.