Billy Sunday, William Thomas Ellis (1914). “Salesman's Prospectus for "Billy" Sunday: The Man and His Message, with His Own Words which Have Won Thousands for Christ”
Samuel Johnson, James Boswell (1825). “The Table Talk of Dr. Johnson: Comprising Opinions and Anecdotes of Life and Literature, Men, Manners, and Morals”, p.119
Charles Haddon Spurgeon (1988). “Spurgeon at His Best: Over 2200 Striking Quotations from the World's Most Exhaustive and Widely-read Sermon Series”, Baker Publishing Group