Cita APA (7th ed.)

Innes, M. A. (2004). The art of singing. Marc Alan Innes.

Cita Chicago (17th ed.)

Innes, Marc Alan. The Art of Singing. Fairview Park, OH: Marc Alan Innes, 2004.

Cita MLA (9th ed.)

Innes, Marc Alan. The Art of Singing. Marc Alan Innes, 2004.