Apel, W. 1., & Apel, W. 1. (1961). The Notation of Polyphonic music, 900-1600 (5. edition.). Cambridge, Mass.
Chicago Style CitationApel, Willi 1893-1988, and Willi 1893-1988 Apel. The Notation of Polyphonic Music, 900-1600. 5. edition. Cambridge, Mass, 1961.
MLA CitationApel, Willi 1893-1988, and Willi 1893-1988 Apel. The Notation of Polyphonic Music, 900-1600. 5. edition. Cambridge, Mass, 1961.
Warning: These citations may not always be 100% accurate.