Марк Спиц — разлика између измена

* {{Cite book|ref=harv|last=Foster|first=Richard J.|title=Mark Spitz: The Extraordinary Life of an Olympic Champion |url=https://books.google.com/books?id=OM2PBQAAQBAJ&pg=PA15 |year=2008|publisher=Santa Monica Press |isbn=978-1-59580-999-5 |pages=15}}