Manookian, J. (1997). Gradus: Progressive piano repertoire in six volumes. Windsor editions.
Chicago Style (17th ed.) CitationManookian, Jeff. Gradus: Progressive Piano Repertoire in Six Volumes. Canadá: Windsor editions, 1997.
MLA引文Manookian, Jeff. Gradus: Progressive Piano Repertoire in Six Volumes. Windsor editions, 1997.
警告:這些引文格式不一定是100%准確.