Apel, W. (1949). The notation of polyphonic music, 900-1600 (4th ed. rev. and with commentary.). Mediaeval Academy of America.
芝加哥风格引文Apel, Willi. The Notation of Polyphonic Music, 900-1600. 4th ed. rev. and with commentary. Cambridge: Mediaeval Academy of America, 1949.
MLA引文Apel, Willi. The Notation of Polyphonic Music, 900-1600. 4th ed. rev. and with commentary. Mediaeval Academy of America, 1949.
警告：这些引文格式不一定是100％准确.