Kayser, H. E. 1., & Baker, T. 1. (1934). The study of the positions for the violin, Op. 67: Thirty-four short pieces for the study of the 2nd, 3rd, 4th, 5th and 7th positions and the half-position. New York: G. Schirmer, Inc..

Kayser, Heinrich Ernest 1815-1888, and Theodore 1851-1934 Baker. The Study of the Positions for the Violin, Op. 67: Thirty-four Short Pieces for the Study of the 2nd, 3rd, 4th, 5th and 7th Positions and the Half-position. New York: G. Schirmer, Inc., 1934.

Kayser, Heinrich Ernest 1815-1888, and Theodore 1851-1934 Baker. The Study of the Positions for the Violin, Op. 67: Thirty-four Short Pieces for the Study of the 2nd, 3rd, 4th, 5th and 7th Positions and the Half-position. New York: G. Schirmer, Inc., 1934.