For classical theories see D.A.Russell, Criticism in Antiquity* (London, 1981), and The Cambridge History of Literary Criticism, vol. I, Classical Criticism, ed. G.A.Kennedy (Cambridge, 1989). D.A.Russell and M. Winterbottom, eds, Ancient Literary Criticism: The Principal Texts in New Translations (Oxford, 1972), is a very useful and wide ranging anthology. W. Trimpi, Muses of One Mind (Princeton, 1983), is a detailed, difficult analysis of classical principles. The last part of D.Daiches, Critical Approaches to Literature* has been expanded (2nd edn, 1981), but it is recommended for its treatment of earlier approaches in Pt 1. For Renaissance theories see B.Vickers, ‘Rhetoric and Poetics’, The Cambridge History of Renaissance Philosophy, ed. C.B.Schmitt et al. (Cambridge, 1988), and R.L.Montgomery, The Reader’s Eye: Studies in Didactic Literary Theory from Dante to Tasso (Berkeley, 1979). T.M.Greene, The Light in Troy: Imitation and Discovery in Renaissance Poetry (New Haven, 1982), is a careful study of the application of theories of imitation.