Wittgenstein, L., Klagge, J. C., & Nordmann, A. (1993). Philosophical occasions, 1912-1951. Hacket.
Lua i Stíl Chicago (17ú heag.)Wittgenstein, Ludwig, James Carl Klagge, agus Alfred Nordmann. Philosophical Occasions, 1912-1951. Indianapolis: Hacket, 1993.
Lua MLA (9ú heag.)Wittgenstein, Ludwig, et al. Philosophical Occasions, 1912-1951. Hacket, 1993.
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