Cita APA (7th ed.)
Scott D. Harrison & Jessica O’Bryan. Teaching Singing in the 21st Century. Springer.
Cita Chicago (17th ed.)
Scott D. Harrison i Jessica O’Bryan. Teaching Singing in the 21st Century. Dordrecht, Holanda: Springer.
Cita MLA (9th ed.)
Scott D. Harrison i Jessica O’Bryan. Teaching Singing in the 21st Century. Springer.
Atenció: Aquestes cites poden no estar 100% correctes.