1. Aaron, R.I.: 1952, The Theory of Universals, Oxford University Press, Oxford.
2. Appel, Toby P.: 1987, The Cuvier-Geoffroy Debate: French Biology in the Decades Before Darwin, Oxford University Press, Oxford.
3. Aristotle: 1967, The Categories, On Interpretation, Prior Analytics, ed. by Harold P. Cooke, Hugh Tredennick, in 23 volumes. Harvard University Press, Cambridge, MA, William Heinemann, London.
4. Ayala, Francisco J.: 1987, 'Biological Reductionism: The Problems and Some Answers', in F. Eugene Yates (ed.), Alan Garfinkel, Donald O. Walter, and Gregory B. Yates (associate eds.) Self-Organizing Systems: The Emergence of Order, Plenum Press, New York, pp. 315–324.
5. Bernstein, Richard J.: 1983, Beyond Objectivism and Relativism: Science, Hermeneutics and Praxis, University of Pennsylvania Press, Philadelphia.