Ingo Faulhaber.„IFFHS“. International Federation of Football History & Statistics. Qaraldi: 15-may 2012-yil.
„THE WORLD'S BEST PLAYMAKER“. International Federation of Football History & Statistics. 2018-yil 15-iyunda asl nusxadan arxivlangan. Qaraldi: 4-fevral 2015-yil.
„THE WORLD'S BEST PLAYMAKER“. International Federation of Football History & Statistics. 2018-yil 15-iyunda asl nusxadan arxivlangan. Qaraldi: 4-fevral 2015-yil.