(1986). Yamaha Grade Examinations 1984 - 1985. Yamaha.
Cita Chicago (17th ed.)Yamaha Grade Examinations 1984 - 1985. Tokyo: Yamaha, 1986.
Cita MLA (8th ed.)Yamaha Grade Examinations 1984 - 1985. Yamaha, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.