See Lion and Mac OS X.
"Mac OS X 10.7." YourDictionary, n.d. Web. 25 June 2018. <http://www.yourdictionary.com/mac-os-x-10-7>.
Mac OS X 10.7. (n.d.). Retrieved June 25th, 2018, from http://www.yourdictionary.com/mac-os-x-10-7
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