“Front Matter.” Pythagoras' Revenge: A Mathematical Mystery, by ARTURO SANGALLI, Princeton University Press, Princeton; Oxford, 2009, pp. i-iv, www.jstor.org/stable/j.ctt7snwk.1. Accessed 15 May 2021.
SANGALLI, A. (2009). Front Matter. In Pythagoras' Revenge: A Mathematical Mystery (pp. I-Iv). Princeton; Oxford: Princeton University Press. Retrieved May 15, 2021, from http://www.jstor.org/stable/j.ctt7snwk.1
SANGALLI, ARTURO. "Front Matter." In Pythagoras' Revenge: A Mathematical Mystery, I-Iv. Princeton; Oxford: Princeton University Press, 2009. Accessed May 15, 2021. http://www.jstor.org/stable/j.ctt7snwk.1.
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