Anon, . (2017). Oxford English Dictionary. Oxford: Oxford University Press.
Borchard, G.A., & Ferri, A.J. (2011). When in Las Vegas, Do As the Ancient Romans Did: bread and circuses then and now. The Journal of Popular Culture, 44(4), 717-731.
Simon, L. (2014). The Greatest Shows on Earth: a history of the circus. London: Reaktion Books.
Wilson, D.A.H. (2009). ‘Crank legislators’, ‘faddists’ and professionals’ defence of animal performance in 1920s Britain. Early Popular Visual Culture, 7(1), 83-101.
Scottish Government. (2017). Business and Regulatory Impact Assessment: Wild Animals in Travelling Circuses (Scotland) Bill. Edinburgh: Scottish Goverment.
Laule, G.E., Bloomsmith, M.A., & Schapiro, S.J. (2003). The Use of Positive Reinforcement Training Techniques to Enhance the Care, Management, and Welfare of Primates in the Laboratory. JOURNAL OF APPLIED ANIMAL WELFARE SCIENCE, 6(3), 163-173.
Scottish Parliamentary Corporate Body. (2017). Wild Animals in Travelling Circuses (Scotland) Bill: policy memorandum. Edinburgh: Scottish Parliament Corporate Body.
Newberry, R.C. (1995). Environmental enrichment: Increasing the biological relevance of captive environments. Applied Animal Behaviour Science, 44, 229-243.
Rayment, M., Asthana, P., van de Weerd, H., Gittins,, J., & Talling, J. (2010, December 22). Evaluation of the EU Policy on Animal Welfare and Possible Policy Options for the Future. Retrieved from
http://www.eupaw.eu/docs/Final%20Report%20-%20EUPAW%20Evaluation.pdf [accessed 28 April 2017]
Mason, G.J., & Latham, N.R. (2004). Can't Stop, Won't Stop: is stereotypy a reliable animal welfare indicator?. Animal Welfare, 13, 57-69.
Ares, E., & Cromarty, H. (2016, April 29). Wild Animals in Circuses.