Where angels fear to tread: Memory research with African elephants, Robert H. I. Dale, M. R. Shyan, D. A. Hagan
Robert H. I. Dale

Behavioral, Vocal, and hormonal relationships in five captive African elephants, M. R. Shyan, Robert H. I. Dale, J. K. Crister, E. Noiles, D. J. Olson
Robert H. I. Dale