the Collection of Keen Johnson”. EasternKentuckyUniversity. June 20, 2008時点のオリジナルよりアーカイブ。2009年9月29日閲覧。 “Kentucky Governor Keen Johnson”. National Governors
Society of Delaware, 1961. Harrison, Lowell. The Civil War in KentuckyUniversity Press of Kentucky, 1975. Josephy, Alvin M. Jr., The Civil War in the American
Yanks Over Europe: American Flyers in World War II. Kentucky, USA: The University Press of Kentucky. ISBN 0-8131-1961-8. Obermaier, Ernst (1989). Die Ritterkreuzträger