Martin, G. E. (1975). The Foundations of geometry and the non-euclidean plane. Intext Educational Publishers.
Lua i Stíl Chicago (17ú heag.)Martin, George E. The Foundations of Geometry and the Non-euclidean Plane. New York: Intext Educational Publishers, 1975.
Lua MLA (9ú heag.)Martin, George E. The Foundations of Geometry and the Non-euclidean Plane. Intext Educational Publishers, 1975.
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