Mark Twain (2017). “The Complete Novels of Mark Twain (Illustrated): 12 American Classics & Author’s Biography: The Adventures of Tom Sawyer & Huckleberry Finn, A Horse’s Tale, The Prince and the Pauper, The American Claimant, The Mysterious Stranger…”, p.4051, e-artnow
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.8, Skyhorse Publishing, Inc.
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.25, Skyhorse Publishing, Inc.