"And I Quote: The Definitive Collection of Quotes, Sayings, and Jokes for the Contemporary Speechmaker". Book by Ashton Applewhite, Tripp Evans and Andrew Frothingham, January 15, 1992.
Winston Churchill's speech at the Institute of Journalists Dinner in London (November 17,1906), as quoted in "Churchill by Himself: The Definitive Collection of Quotations" edited by Richard Langworth (p. 392), 2008.
Will Rogers, Bryan B. Sterling (1995). “Will Rogers Speaks: Over 1,000 Timeless Quotations for Public Speakers (writers, Politicians, Comedians, Browsers ...)”, M Evans & Company
Will Rogers, Bryan B. Sterling, Frances N. Sterling (1993). “Will Rogers' World: America's Foremost Political Humorist Comments on the Twenties and Thirties--and Eighties and Nineties”, p.80, Rowman & Littlefield