http://petrucci.mus.auth.gr/imglnks/usimg/f/f4/IMSLP34426-PMLP03629-ribs0980_02.pdf
http://conquest.imslp.info/files/imglnks/usimg/a/ad/IMSLP34273-PMLP03629-ribs0982-03.pdf
http://www.danielcabrio.com.ar/105s.pdf
https://musescore.com/user/385716/scores/5551610
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/