Wittgenstein, L. (1958). Preliminary studies for the "Philosophical investigations": Generally known as the Blue and Brown books ([2nd ed.].). Harper and Row.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWittgenstein, Ludwig. Preliminary Studies for the "Philosophical Investigations": Generally Known as the Blue and Brown Books. [2nd ed.]. New York: Harper and Row, 1958.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWittgenstein, Ludwig. Preliminary Studies for the "Philosophical Investigations": Generally Known as the Blue and Brown Books. [2nd ed.]. Harper and Row, 1958.
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