Thomson, A. J. C., C. C. Bannister, R. T. Marshall, N. McNeil, D. M. Mear, S. Lovick-Earle, and M. Cuculescu-Santana. “Interest in Coloured Objects and Behavioural Budgets of Individual Captive Freshwater Turtles”. Journal of Zoo and Aquarium Research, vol. 9, no. 4, Oct. 2021, pp. 218-27, doi:10.19227/jzar.v9i4.623.