| On the Fourfold Root of the Principle of Sufficient Reason and Other Writings Schopenhauer, Arthur; Cartwright, David E. (EDT); Erdmann, Edward E. (EDT); Janaway, Christopher (EDT) / Used - Hardcover | GreatBookPrices | As new | $308.79 |
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| Schopenhauer: On the Fourfold Root of the Principle of Sufficient Reason and Other Writings (The Cambridge Edition of the Works of Schopenhauer) Schopenhauer, Arthur / Used - Hardcover | Mispah books | As new | $278.18 |
| On the fourfold root of the principle of sufficient reason (The Open Court library of philosophy) Schopenhauer, Arthur / Used - Hardcover | Mispah books | Dust Jacket | $228.85 |
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