Cita APA (7th ed.)

Tetrazzini, L. (1923). How to sing. George H. Doran company.

Cita Chicago (17th ed.)

Tetrazzini, Luisa. How to Sing. New York: George H. Doran company, 1923.

Cita MLA (9th ed.)

Tetrazzini, Luisa. How to Sing. George H. Doran company, 1923.