"John Gould The Bird Man: A Chronology and Bibliography" compiled by Gordon C. Sauer, Illustrations, Section 4, Box: 34, Folder: 36-39. 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/205984 Accessed June 17, 2024.