How should the psychological welfare of zoo elephants be investigated?

Title:	How should the psychological welfare of zoo elephants be investigated?
Author:	Mason, G.J.; Veasey, J.
URI:	http://hdl.handle.net/10214/5368
Date:	2008
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Citation:	G. Mason & Jake Veasey (2008). How should the psychological welfare of zoo elephants be investigated? Chapter 11 in: An Elephant in the Room: the Science and Well Being of Elephants in Captivity, eds. D. L. Forthman, L. F. Kane & P. F. Waldau. Tufts University Cummings School of Veterinary Medicine’s Center for Animals and Public Policy, North Grafton, MA, pp. 154-174.