Books about Philosophy (sorted alphabetically)
- Thoughts on Life and Religion F. Max Müller
- trésor des humbles (French) Maurice Maeterlinck
- Twilight of the Idols; or, How to Philosophize with the Hammer. The Antichrist Friedrich Wilhelm Nietzsche
- Uren met Schopenhauer (Dutch) Arthur Schopenhauer
- Valitut teokset 1910-1922 (Finnish) Eino Kaila
- What I believe Bertrand Russell
- What Nietzsche Taught Willard Huntington Wright
- Wille zur Macht: Eine Auslegung alles Geschehens (German) Friedrich Wilhelm Nietzsche
- Will to Believe, and Other Essays in Popular Philosophy William James
- 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
- World's Greatest Books — Volume 13 — Religion and Philosophy
- World's Greatest Books — Volume 14 — Philosophy and Economics
- Zur neuen Lehre: Betrachtungen (German) H. Druskowitz
- Ερυξίας, Αξίοχος, Αλκυών (Modern Greek (1453-)) Plato
- Κριτίας, Ίππαρχος, Αντερασταί (Modern Greek (1453-)) Plato