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2. Arneson, R. (2013). Egalitarianism. Retrieved from The Stanford Encyclopedia of Philosophy website: 〈https://plato.stanford.edu/archives/sum2013/entries/egalitarianism/〉.
3. Pricing Recreation and Park Services: the Science and the Art;Crompton,2016
4. The role of moral philosophies, operational criteria and operational strategies in determining equitable allocation of resources for leisure services in the United States;Crompton;Leisure Studies,2008
5. Dancy, J. (2017). Moral Particularism. Retrieved from The Stanford Encyclopedia of Philosophy website: 〈https://plato.stanford.edu/archives/win2017/entries/moral-particularism/〉.