"John Gould the Bird Man: Correspondence, Volume 2, 1839 through 1841", edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, draft, 1997-02-11, Box: 40, Folder: 24-27. 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/206052 Accessed March 22, 2025.