^Lichtman, Allan J. Prejudice and the Old Politics: The Presidential Election of 1928. : 93–96. ISBN 0739101269.
^Babson’s Statistics Do Not Assure G.O.P. Governor Is Gaining — Kentucky Supporters Will Probably Turn State for New Yorker and Strength in Missouri Increased; Statistician Declares Smith’s Popularity Steadily Increasing. The Bristol Herald-Courier (Bristol, Tennessee). 1928-10-21: B1.