Brown, Janine L., Goeritz, Frank, Pratt-Hawes, N., Hermes, Robert, Galloway, M., Graham, L. H., Gray, C., Walker, S. L., Gomez, A., and Moreland, R. 2004. "Successful Artificial Insemination of an Asian Elephant at the National Zoological Park." Zoo biology. 23 (1):45–64.