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Allen, J.L.; Janssen, D.L.; Oosterhuis, J.E.; Stanley, T.H. 1991. Immobilization of captive non-domestic hoofstock with carfentanil. Proceedings of the American Association of Zoo Veterinarians 1991: 336-340, 2 tables.

Mann, P.C.; Bush, M.; Janssen, D.L.; Frank, E.S.; Montali, R.J. 1981. Clinicopathologic correlations of tuberculosis in large zoo mammals. Journal of the American Veterinary Medicine Association 179 (11): 1123-1129, 5 figures, 2 tables.