Duckworth, W. (1998). A creative approach to music fundamentals (6th ed.). Wadsworth Pub.
Citazione stile Chigago Style (17a edizione)Duckworth, William. A Creative Approach to Music Fundamentals. 6th ed. Belmont, Calif: Wadsworth Pub, 1998.
Citatione MLA (9a ed.)Duckworth, William. A Creative Approach to Music Fundamentals. 6th ed. Wadsworth Pub, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.