References:
- https://www.olympicchannel.com/en/athletes/detail/michael-phelps-ii/
- https://swimswam.com/bio/caeleb-dressel/
- https://tonyflorida.com/caeleb-dressel/
- https://peoplepill.com/people/kosuke-hagino/
- https://kids.kiddle.co/Grant_Hackett
- https://en.wikipedia.org/wiki/Grant_Hackett
- https://www.famousbirthdays.com/people/denis-pankratov.html
- https://en.wikipedia.org/wiki/Denis_Pankratov
- https://www.olympic.org/mark-spitz
- https://sports.jrank.org/pages/4827/Thompson-Jenny.html
- https://www.tvguide.com/celebrities/dara-torres/bio/215960/
- https://swimswam.com/8-things-you-didnt-know-about-olympian-nathan-adrian/
- https://www.britannica.com/biography/Krisztina-Egerszegi
- https://www.britannica.com/biography/Libby-Trickett
- https://www.britannica.com/biography/Yana-Klochkova
- https://www.redbookmag.com/life/mom-kids/news/a45470/dana-vollmer-facts-olympic-swimmer-2016/