Cita APA (7th ed.)

(1996). Singer's world: Book 4 : for high voice. Trinity College London.

Cita Chicago (17th ed.)

Singer's World: Book 4 : For High Voice. London: Trinity College London, 1996.

Cita MLA (9th ed.)

Singer's World: Book 4 : For High Voice. Trinity College London, 1996.