https://www.atptour.com/en/players/roger-federer/f324/overview

https://notice.aenetworks.com/

https://www.britannica.com/biography/Roger-Federer

https://www.thefamouspeople.com/profiles/roger-federer-2741.php

https://en.wikipedia.org/wiki/Roger_Federer

https://www.atptour.com/en/players/atp-head-2-head/roger-federer-vs-rafael-nadal/F324/N409

https://www.who.com.au/roger-federer-kids

https://www.theage.com.au/sport/tennis/federer

https://www.swissinfo.ch/eng/roger-federer_18-things-you-might-not-know-about-him/42919428