"John Gould the Bird Man: Correspondence with a Chronology of His Life and Works", Volume 1, edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, draft, 1987, Box: 38, Folder: 21-23. 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/206033 Accessed July 26, 2024.