22. References
The History of the Official World Cup Match Balls
http://www.soccerballworld.com/HistoryWCBalls.htm
Fifa World Cup match balls through history
Telegraph
http://www.telegraph.co.uk/sport/football/world-
cup/pictures/6670565/Fifa-World-Cup-match-balls-
through-history.html?image=31
Worldcup balls info
http://www.worldcupballs.info/home
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