Pfeiffer, P. E. (1978). Concepts of probability theory (2nd rev. ed.). Dover Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPfeiffer, Paul E. Concepts of Probability Theory. 2nd rev. ed. New York: Dover Publications, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPfeiffer, Paul E. Concepts of Probability Theory. 2nd rev. ed. Dover Publications, 1978.
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