Gruenberg, E. (1919). Violin teaching and violin study rules and hints for teachers and students. Carls Fischer.
Citace podle Chicago (17th ed.)Gruenberg, Eugene. Violin Teaching and Violin Study Rules and Hints for Teachers and Students. New York: Carls Fischer, 1919.
Citace podle MLA (9th ed.)Gruenberg, Eugene. Violin Teaching and Violin Study Rules and Hints for Teachers and Students. Carls Fischer, 1919.
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