APA (7th ed.) Citation

Barber, S., Barber, S., & Villa, J. G. (1944). Two songs for medium voice and piano. G. Schirmer, Inc.

Chicago Style (17th ed.) Citation

Barber, Samuel, Samuel Barber, and José García Villa. Two Songs for Medium Voice and Piano. New York: G. Schirmer, Inc, 1944.

MLA (9th ed.) Citation

Barber, Samuel, et al. Two Songs for Medium Voice and Piano. G. Schirmer, Inc, 1944.