“Categories.” A Guide to Groups, Rings, and Fields, by Fernando Q. Gouvêa, 1st ed., vol. 48, Mathematical Association of America, 2012, pp. 9–16, www.jstor.org/stable/10.4169/j.ctt6wpw6p.6. Accessed 27 May 2020.
Gouvêa, F. (2012). Categories. In A Guide to Groups, Rings, and Fields (pp. 9-16). Mathematical Association of America. Retrieved May 27, 2020, from www.jstor.org/stable/10.4169/j.ctt6wpw6p.6
Gouvêa, Fernando Q. "Categories." In A Guide to Groups, Rings, and Fields, 9-16. Mathematical Association of America, 2012. Accessed May 27, 2020. www.jstor.org/stable/10.4169/j.ctt6wpw6p.6.
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