Ana 423.II.2. Mengelberg, Willem(1)
Mus.Nachl. F. Busoni B II, 3107 (olim: Mus.ep. W. Mengelberg 1)(1)
Mus.Nachl. Wüllner, F., 22,405(1)
Mus.Nachl. Wüllner, F., 22,406(1)
Mus.Nachl. Wüllner, F., 22,407(1)
Mus.Nachl. Wüllner, F., 22,408(1)
Mus.Nachl. Wüllner, F., 22,409(1)
Mus.Nachl. Wüllner, F., 22,410(1)