Apel, W. 1., & Apel, W. 1. (1949). The notation of polyphonic music, 900-1600 (4. edition, revised and with commentary.). Cambridge, Massachusetts: The Mediaeval Academy of America.
Chicago Style CitationApel, Willi 1893-1988, and Willi 1893-1988 Apel. The Notation of Polyphonic Music, 900-1600. 4. edition, revised and with commentary. Cambridge, Massachusetts: The Mediaeval Academy of America, 1949.
MLA CitationApel, Willi 1893-1988, and Willi 1893-1988 Apel. The Notation of Polyphonic Music, 900-1600. 4. edition, revised and with commentary. Cambridge, Massachusetts: The Mediaeval Academy of America, 1949.
Warning: These citations may not always be 100% accurate.