Pitcher, G. (1968). Wittgenstein: Ed. by George Pitcher. Macmillan.
Lua i Stíl Chicago (17ú heag.)Pitcher, George. Wittgenstein: Ed. by George Pitcher. London: Macmillan, 1968.
Lua MLA (8ú heag.)Pitcher, George. Wittgenstein: Ed. by George Pitcher. Macmillan, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.