https://www.florugby.com/articles/6225326-usa-men-name-roster-for-sevens-world-cup

http://www.americasrugbynews.com/2018/07/16/up-and-under-148/

https://theprovince.com/sports/rugby/threes-a-charm-germany-confirmed-as-canadas-latest-rugby-world-cup-qualifying-foe