1998–99 Manchester United F.C. season - Wikipedia
1999 UEFA Champions League final - Wikipedia
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The Championship Manager 99-00 Challenge: December '99 - The Busby, championship manager
How many football teams have won the treble in the UK? - Quora
The Championship Manager 99-00 Challenge: December '99 - The Busby, championship manager
What is the definition of 'treble' in relation to sports (soccer, tennis, etc.)? What are some examples of its use or misuse? - Quora
1998-99 season, Manchester United Wiki
1998-99 CL Final マンU vs バイエルン マッチデープログラム
Manchester United Treble Champions Watch
気に入って購入 1998-99 CL Final マンU vs バイエルン マッチデープログラム - 雑誌