1. Animal welfare: A complex international public policy issue: economic, policy, societal, cultural and other drivers and constraints. A 20-year international perspective;Bayvel;Anim Welfare,2012
2. World Organisation for Animal Health (OIE). What is Animal Welfare? Assessed at https://www.oie.int/en/animal-welfare/animal-welfare-at-a-glance/; 2017 [downloaded 5/6/20].
3. Agricultural ethics;Burkhardt;CAST Issue Paper,2005
4. Timeline of animal welfare and right. Wikipiedia. Assessed at https://wikipedia.org/wiki/Timeline_of_animal_welfare_and_rights; 2019 [downloaded 5/9/19].
5. History of animal rights. Wikipedia. Assessed at https://en.wikipedia.org/wiki/History_of_animal_rights; 2021 [downloaded 2/16/22].