Knudson, D. (2002, 17. May). Improving stroke technique using biomechanical principles. Zugriff unter http://coachesinfo.com/index.php?option=com_content&view=article&id=338:tennis-stroketechnique-article&catid=95:tennis-general-articles&Itemid=173
APA (7th ed.) CitationKnudson, D. Improving stroke technique using biomechanical principles. coachesinfo.com.
Chicago Style (17th ed.) CitationKnudson, D. "Improving Stroke Technique Using Biomechanical Principles." Coachesinfo.com .
MLA (9th ed.) CitationKnudson, D. "Improving Stroke Technique Using Biomechanical Principles." Coachesinfo.com, .
Warning: These citations may not always be 100% accurate.