Tohutoro APA (7th ed.)
Tietze, H. (1965). Famous problems of mathematics. Graylock.
Tohutoru Kātū Chicago (17th ed.)
Tietze, Heinrich. Famous Problems of Mathematics. Nueva York, EUA: Graylock, 1965.
Tohutoro MLA (9th ed.)
Tietze, Heinrich. Famous Problems of Mathematics. Graylock, 1965.
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