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3. Ashton, M. C. (2022). Individual differences and personality (4th ed.). Academic Press.
4. Caldwell K. (2017). Which kinds of pro-vegetarian videos are best at inspiring changes in diets and attitudes? Mercy for Animals. https://mercyforanimals.org/kinds-of-viral-videos-are-best-at-inspiring
5. The moral standing of animals: Towards a psychology of speciesism.