Ashby, Kevin; Adams, Sam. adidas Tango 12 unveiled as official ball. UEFA.com (Union of European Football Associations). 2 December 2011 [6 December 2011]. (原始内容存档于2012-06-15).
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Ashby, Kevin; Adams, Sam. adidas Tango 12 unveiled as official ball. UEFA.com (Union of European Football Associations). 2 December 2011 [6 December 2011]. (原始内容存档于2012-06-15).