Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.31, Skyhorse Publishing, Inc.
George MacDonald (2015). “THOMAS WINGFOLD, CURATE + PAUL FABER, SURGEON + THERE AND BACK - The Complete Series: The Curate's Awakening, The Lady's Confession & The Baron's Apprenticeship”, p.838, e-artnow
John Adams, Abigail Adams, Thomas Jefferson (1988). “The Adams-Jefferson Letters: The Complete Correspondence Between Thomas Jefferson and Abigail and John Adams”