Michael Phelps wins 15th Gold - Men's 100m Butterfly
The First Swim That Really Meant Something: 20 Years Since Phelps
Michael Phelps: Finally at peace with swimming, himself – Sun Sentinel
Michael Phelps: Finally at peace with swimming, himself – Sun Sentinel
Michael Phelps - Wikipedia
The rise (and fall, and rise) of Michael Phelps
London 2012: Phelps Sets New Olympic Record With 19 Medals