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Spencer Collection, The New York Public Library. "Magic squares" The New York Public Library Digital Collections. 1540 - 1545. https://old-digitalcollections.nypl.org/items/421ca8d0-28ec-0138-8b41-2348918a20a1
Spencer Collection, The New York Public Library. "Magic squares" New York Public Library Digital Collections. Accessed September 25, 2026. https://old-digitalcollections.nypl.org/items/421ca8d0-28ec-0138-8b41-2348918a20a1
Spencer Collection, The New York Public Library. (1540 - 1545). Magic squares Retrieved from https://old-digitalcollections.nypl.org/items/421ca8d0-28ec-0138-8b41-2348918a20a1
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