Originál: 12 Studies, Opus 31. Sebastian Lee. 12 Studies, Opus 31 composed by Sebastian Lee. Double Bass sheet music.
Preklad: 12 Štúdie, Opus 31. 12 Štúdie, Opus 31 zložené Sebastian Lee. Double Bass noty. 1805-1887. Zmenené Fred Zimmerman. IM.1913.