Cita APA (7th ed.)

Harrison, S. D., & O'Bryan, J. (2014). Teaching singing in the 21st century. Springer.

Cita Chicago (17th ed.)

Harrison, Scott David, i Jessica O'Bryan. Teaching Singing in the 21st Century. Dordrecht: Springer, 2014.

Cita MLA (9th ed.)

Harrison, Scott David, i Jessica O'Bryan. Teaching Singing in the 21st Century. Springer, 2014.