References

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

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

http://www.realmadrid.com/en/football

http://www.foxsports.com.au/football/the-euros/cristiano-ronaldo-stretchered-off-in-euro-2016-final-against-france/news-story/c8d093e146868887db63bac4cd85ef06

https://www.brianmac.co.uk/want.htm

https://www.brianmac.co.uk/vo2max.htm

https://www.brianmac.co.uk/speed60.htm