APA (7 वां संस्करण) प्रशस्ति पत्र
Osterreichische Ludwig Wittgenstein Gesellschaft, ProQuest (Firm), Pichler, A., & Saatela, S. (2006). Wittgenstein: The philosopher and his works (2nd ed.). Ontos Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Osterreichische Ludwig Wittgenstein Gesellschaft, ProQuest (Firm), Alois Pichler, और Simo Saatela. Wittgenstein: The Philosopher and His Works. 2nd ed. Frankfurt: Ontos Verlag, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Osterreichische Ludwig Wittgenstein Gesellschaft, et al. Wittgenstein: The Philosopher and His Works. 2nd ed. Ontos Verlag, 2006.
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