Colwin, C. (2003). Michael Phelps' head position. Swimming Technique, El Segundo 40(2003)3, S. 12-14..
APA (7th ed.) CitationColwin, C. (2003). Michael Phelps' head position Swimming Technique.
Chicago Style (17th ed.) CitationColwin, C. "Michael Phelps' Head Position." Swimming Technique 2003.
MLA (9th ed.) CitationColwin, C. "Michael Phelps' Head Position." Swimming Technique, 2003.
Warning: These citations may not always be 100% accurate.