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以下すべてsortalsに関連する文献である。刊行年代順に並べる。

• W.V. Quine　　“Review of Reference and Generality by Peter Thomas Geach”,　in: The Philosophical Review, vol. 73, no. 1, 1964
• Leslie Stevenson　　“Relative Identity and Leibniz's Law”,　in: The Philosophical Quarterly, vol. 22, no. 87, 1972
• Fred Feldman　　“Sortal Predicates”,　in: Nous, vol. 7, no. 3, 1973
• H. W. Noonan　　“On the Notion of a Sortal Concept”,　in: The Philosophical Quarterly, vol. 28, no. 110, 1978
• ditto　　　　“Sortal Concepts and Identity”,　in: Mind, New Series, vol. 87, no. 346, 1978
• William P. Alston and Jonathan Bennett　　“Identity and Cardinality: Geach and Frege”,　in: The Philosophical Review, vol. 93, no. 4, 1984
• E.J. Lowe　　“What is a Criterion of Identity?”,　in: The Philosophical Review, vol. 39, no. 154, 1989
• Penelope Mackie　　“Sortal Concepts and Essential Properties”,　in: The Philosophical Quarterly, vol. 44, no. 176, 1994