Roberts, R. (1972). Musical instruments made to be played (5th ed.). Dryad Press.
Cita Chicago (17th ed.)Roberts, Ronald. Musical Instruments Made to Be Played. 5th ed. Leicester: Dryad Press, 1972.
Cita MLA (8th ed.)Roberts, Ronald. Musical Instruments Made to Be Played. 5th ed. Dryad Press, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.