“Preface.” Henri Poincare: A Scientific Biography, by JEREMY GRAY, Princeton University Press, PRINCETON; OXFORD, 2013, pp. xi-xvi, www.jstor.org/stable/j.ctt1r2fwt.4. Accessed 24 July 2021.
GRAY, J. (2013). Preface. In Henri Poincare: A Scientific Biography (pp. Xi-Xvi). PRINCETON; OXFORD: Princeton University Press. Retrieved July 24, 2021, from http://www.jstor.org/stable/j.ctt1r2fwt.4
GRAY, JEREMY. "Preface." In Henri Poincare: A Scientific Biography, Xi-Xvi. PRINCETON; OXFORD: Princeton University Press, 2013. Accessed July 24, 2021. http://www.jstor.org/stable/j.ctt1r2fwt.4.
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