Wittgenstein, L. (1997). Generally known as the blue and brown books. Blackwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWittgenstein, Ludwig. Generally Known as the Blue and Brown Books. Blackwell, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWittgenstein, Ludwig. Generally Known as the Blue and Brown Books. Blackwell, 1997.
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