Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.37, Skyhorse Publishing, Inc.
John Gay, Nathaniel Cotton, Edward Moore (1826). “Gay's Fables and other poems: Cotton's visions in verse ; Moore's Fables for the female sex ; with sketches of the authors' lives”, p.20