Kraft, L. (1976). Gradus - Book II An integrated approach to harmony, counterpoint, and analysis. W. W. Norton & Company Inc.
Chicago-viite (17. p.)Kraft, Leo. Gradus - Book II An Integrated Approach to Harmony, Counterpoint, and Analysis. W. W. Norton & Company Inc, 1976.
MLA-viite (8. p.)Kraft, Leo. Gradus - Book II An Integrated Approach to Harmony, Counterpoint, and Analysis. W. W. Norton & Company Inc, 1976.
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