Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.17, Skyhorse Publishing, Inc.
Henry Ward Beecher (1887). “Patriotic Addresses in America and England from 1850 to 1885, on Slavery, the Civil War and the Development of Civil Liberty in the United States”