Christie's, London. Catalog of the Godman Collection of Watercolours for John Gould's "The Birds of Great Britain", 1994, Box: 68, Folder: 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/204958 Accessed July 26, 2024.