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Colligan, Tom. “Tennis Physics: Anatomy of a Serve.” Popular Mechanics. Hearst Communication, 2014. Web. 15 Oct. 2014
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Giblin, Georgia. “Smashing Success: The Science behind Kyrgios’ Serve.” The Conversation. Conversation Trust, 2010. Web. 15 Oct. 2014. <http://theconversation.com/smashing-success-the-science-behind-kyrgios-serve-28709>.
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<http://www.essentialtennisinstruction.com/roger-federer-%E2%80%93-the-perfect-model-for-your-serve/>.
"Physics of Tennis." Physics 139. WordPress, 13 Dec. 2012. Web. 20 Nov. 2014.
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