Mann, W.M. 1940. National Zoological Park Report (An Indian rhinoceros gift from Assam). Annual Report of the Board of Regents of the Smithsonian Institution 1940 (pub. 1941): Select pages.
PDF download available
Mann, W.M. 1930. Wild animals in and out of the zoo. Washington DC, Smithsonian Scientific Series (vol. 6): pp. 1-362.