Meschkowski, H. (1966). Unsolved and unsolvable problems in geometry. F. Ungar Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMeschkowski, Herbert. Unsolved and Unsolvable Problems in Geometry. New York: F. Ungar Publishing, 1966.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMeschkowski, Herbert. Unsolved and Unsolvable Problems in Geometry. F. Ungar Publishing, 1966.
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