APA (7th ed.) Citation

Copland, A., Schuman, W., & Barber, S. An American triptych: The Gregg Smith Singers. Transatlantic Records.

Chicago Style (17th ed.) Citation

Copland, Aaron, William Schuman, and Samuel Barber. An American Triptych: The Gregg Smith Singers. London: Transatlantic Records.

MLA (9th ed.) Citation

Copland, Aaron, et al. An American Triptych: The Gregg Smith Singers. Transatlantic Records.