Books about Knowledge, Theory of (sorted alphabetically)
- Senses and the Mind Anonymous
- Six metaphysical meditations René Descartes
- System of Logic, Ratiocinative and Inductive John Stuart Mill
- System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. I John Stuart Mill
- System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. II John Stuart Mill
- System of Logic, Ratiocinative and Inductive (Vol. 1 of 2) John Stuart Mill
- Treatise Concerning the Principles of Human Knowledge George Berkeley
- Treatise of Human Nature David Hume
- Treatise of Human Nature David Hume
- World as Will and Idea (Vol. 1 of 3) Arthur Schopenhauer
- World as Will and Idea (Vol. 2 of 3) Arthur Schopenhauer
- World as Will and Idea (Vol. 3 of 3) Arthur Schopenhauer
- Θεαίτητος (Greek) Plato