Sutton, George Miksch. "The Juvenal Plumage and Postjuvenal Molt in Several Species of Michigan Sparrows". Cranbrook Institute of Science, 1935-09, Box: 98, Folder: 39. Sauer's Gouldiana Research about John Gould and other papers, MS 304. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/205395 Accessed July 26, 2024.