WASET
    S. J. Higgs and  E. Van Eck and  K. Heynis and  S. H. Broadberry,  Humans as Enrichment: Human-Animal Interactions and the Perceived Benefit to the Cheetah (Acinonyx jubatus), Human and Zoological Establishment.   journal   = {International Journal of Animal and Veterinary Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2018, vol. 135(3). 97 - 103
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10008762.