3. Quomodo historia conscribenda sit, 8.
4. De institutione oratoria, X, ii, 21.
5. Poetik, Rhetorik, und Stilistik (Halle, 1886), pp. 14, 261.
6. Poetry, with Reference to Aristotle's Poetics, Ed. A.S. Cook (Boston, 1891), pp. 10-11.
7. Estetica (Milano, 1902), I, II, and appendix.
8. Enjoyment of Poetry (New York, 1916), p. 66.
9. Georges Renard, La method scientifique de l'histoire littéraire. (Paris, 1900), p. 385.