Greenberg, M. J. (1980). Euclidean and Non-Euclidean Geometries: Development and history (2nd ed.). W. H. Freeman and Co..
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Dyfyniad Arddull Chicago
Greenberg, Marvin Jay. Euclidean and Non-Euclidean Geometries: Development and History. 2nd ed. New York: W. H. Freeman and Co., 1980.
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Dyfyniad MLA
Greenberg, Marvin Jay. Euclidean and Non-Euclidean Geometries: Development and History. 2nd ed. W. H. Freeman and Co., 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.