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Line,
S. W., Morgan, K. N., & Markowitz, H. (1991).
Simple toys do not alter the behavior of aged
Rhesus monkeys. Zoo Biology, 10, 473-484. Online
version
Markowitz,
H., Schmidt, M. J., & Moody, A. (1978). Behavioral
engineering and animal health in the zoo. International Zoo Yearbook, 18, 190-194.
Markowitz,
Hal, (1978, Spring), Engineering environments
for behavioral opportunities in the zoo. The Behavior Analyst, 1 (1), 34-47.