Jacobson, S. L., Hopper, L. M., Shender, M. A., Ross, S. R., Leahy, M., & McNernie, J. (2017). Zoo visitors’ perceptions of chimpanzee welfare are not affected by the provision of artificial environmental enrichment devices in a naturalistic exhibit. Journal of Zoo and Aquarium Research, 5(1), 56–61. https://doi.org/10.19227/jzar.v5i1.250