原文: Studies for Developing Agility, Strength of Fingers, and Purity of Intonation. Bernhard Cossmann. Cello Solo sheet music. 1822-1910.
译文: Studies for Developing Agility, Strength of Fingers, and Purity of Intonation composed by Bernhard Cossmann. 伯恩哈德Cossmann. 大提琴独奏乐谱.