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.150, Rowman & Littlefield
Daily Telegram number 2678 on March 06, 1935. "Will Rogers' Daily Telegrams: The Roosevelt years, 1933-1935". Book edited by Steven Gragert and James Smallwood, 2008.