"John Gould the Bird Man: Correspondence", edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, prelims and, 1842, Box: 41, Folder: 3-4. 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/206058 Accessed June 26, 2024.