See Mavericks and Mac OS X.
"Mac OS X 10.9." YourDictionary, n.d. Web. 21 September 2018. <http://www.yourdictionary.com/mac-os-x-10-9>.
Mac OS X 10.9. (n.d.). Retrieved September 21st, 2018, from http://www.yourdictionary.com/mac-os-x-10-9
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