Izvornik: Selected Ferling Etudes for Alto Saxophone. De Haske Intl Play Along Book. Nobuya Sugawa. Alto Saxophone sheet music.
Prijevod: Odabrani Ferling Etide za alt saksofon. S Gravity Andante u F-molu. Alt saksofon note. Piano note. Alto Sax knjiga s 2 CD-a.
