See Sierra and Mac OS X.
"Mac OS X 10.12." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/mac-os-x-10-12>.
Mac OS X 10.12. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/mac-os-x-10-12
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