Universals/Bibliography

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• Armstrong, David (1989). Universals: An Opinionated Introduction. Boulder, Colorado: Westview Press. 
• Mellor, D. H.; Alex Oliver (1997). Properties. Oxford: Oxford University Press. 
• Moreland, J. P. (1997). Universals. Chesham: Acumen. ISBN 1902683234. 
• Plato - Parmenides
• Plato - Republic
• Wolterstorff, Nicholas (1970). On Universals: an Essay in Ontology. Chicago: University of Chicago Press. 

Trope Theory

• Campbell, Keith (1990). Abstract particulars. Oxford: Blackwell. ISBN 0631147071.