Forrás: Summa Kitharologica, Volume 1 The Physiology of Guitar Playing. Functional Anatomy and Physiomechanics. Ricardo Iznaola. Guitar sheet music.
Fordítás: Funkcionális anatómia és Physiomechanics. Gitár kották. Functional Anatomy and Physiomechanics composed by Ricardo Iznaola. 1949 -. A gitár.