« Boxing » [archive du ], sur Encarta (consulté le ) : « If one fighter manages to capture the titles of all the major organizations at once, this is known as "unifying" the title and the boxer is the "undisputed" champion. », p. 5 "Professional Boxing"
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« Boxing » [archive du ], sur Encarta (consulté le ) : « If one fighter manages to capture the titles of all the major organizations at once, this is known as "unifying" the title and the boxer is the "undisputed" champion. », p. 5 "Professional Boxing"