CARCASSI, M., Op. 60 Estudios progresivos
http://imslp.org/wiki/Etudes,_Op.60_(Carcassi,_Matteo)
http://boije.statensmusikverk.se/ebibliotek/boije/pdf/Boije%2094.pdf
http://www.classicalguitarschool.net/music/1007.pdf
http://totalguitarist.com/music/classical/c/carcassi/op-60-twenty-five-etudes.pdf
https://www.wuala.com/EdsonLopes/Matteo_Carcassi/
