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.19, Rowman & Littlefield
Interview With Nicolle Wallace, Mike Barnicle, Mark Halperin, Richard Haass, and Katty Kay of MSNBC's Morning Joe, 2009-2017.state.gov. September 29, 2015.