“The Essayist.” Henri Poincare: A Scientific Biography, by JEREMY GRAY, Princeton University Press, PRINCETON; OXFORD, 2013, pp. 27–152, www.jstor.org/stable/j.ctt1r2fwt.6. Accessed 28 Oct. 2020.
GRAY, J. (2013). The Essayist. In Henri Poincare: A Scientific Biography (pp. 27-152). PRINCETON; OXFORD: Princeton University Press. Retrieved October 28, 2020, from http://www.jstor.org/stable/j.ctt1r2fwt.6
GRAY, JEREMY. "The Essayist." In Henri Poincare: A Scientific Biography, 27-152. PRINCETON; OXFORD: Princeton University Press, 2013. Accessed October 28, 2020. http://www.jstor.org/stable/j.ctt1r2fwt.6.
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