"Heimskringla: The Norse king sagas" by Snorre Sturlason - London: J.M. Dent and Sons LTD, (date unknown), Box: 25, Volume: 40. Personal papers of Joseph M. Kellogg, PP 237. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/136872 Accessed May 20, 2024.