Tohutoro APA (7th ed.)
Northrop, E. P. Rätselvolle Mathematik.
Tohutoru Kātū Chicago (17th ed.)
Northrop, Eugene Purdy. Rätselvolle Mathematik.
Tohutoro MLA (9th ed.)
Northrop, Eugene Purdy. Rätselvolle Mathematik.
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