Wells, D. (1991). The Penguin dictionary of curious and interesting geometry. London: Penguin Books.
Παραπομπή Chicago StyleWells, David. The Penguin Dictionary of Curious and Interesting Geometry. London: Penguin Books, 1991.
Παραπομπή MLAWells, David. The Penguin Dictionary of Curious and Interesting Geometry. London: Penguin Books, 1991.
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