Kraft, L. (1976). Gradus: An integrated approach to harmony, counterpoint, and analysis. Norton.
芝加哥风格引文Kraft, Leo. Gradus: An Integrated Approach to Harmony, Counterpoint, and Analysis. New York: Norton, 1976.
MLA引文Kraft, Leo. Gradus: An Integrated Approach to Harmony, Counterpoint, and Analysis. Norton, 1976.
警告：这些引文格式不一定是100％准确.