Greenberg, M. J. (1980). Euclidean and Non-Euclidean Geometries: Development and history (2nd ed.). W. H. Freeman and Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreenberg, Marvin Jay. Euclidean and Non-Euclidean Geometries: Development and History. 2nd ed. New York: W. H. Freeman and Co., 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGreenberg, Marvin Jay. Euclidean and Non-Euclidean Geometries: Development and History. 2nd ed. W. H. Freeman and Co., 1980.
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