"John Gould the Bird Man: Correspondence, Volume 4, 1846 through 1851, With a Chronology of his Life and Works", edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, Box: 42, Folder: 4-9. 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/206066 Accessed June 02, 2024.