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3. David, Armand, and Helen M. Fox. Abbé David’s Diary: Being an Account of the French Naturalist’s Journeys and Observations in China in the Years 1866 to 1869. Cambridge: Harvard University Press, 1949.
4. Deuchler, Douglas, and Carla W. Owens. Images of American Brookfield Zoo and the Chicago Zoological Society. Charleston SC: Arcadia Publishing, 2009.
5. Diary no. 7 (June 29-July 16 1929). Smithsonian Institution Archives. Series 2 Box 1.