See El Capitan and Mac OS X.
"Mac OS X 10.11." YourDictionary, n.d. Web. 15 September 2018. <http://www.yourdictionary.com/mac-os-x-10-11>.
Mac OS X 10.11. (n.d.). Retrieved September 15th, 2018, from http://www.yourdictionary.com/mac-os-x-10-11
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