APA (7th ed.) Citation

Weisgall, H., Weber, B., & Yeats, W. B. (1959). Purgatory: Opera in one act. Merion Music.

Chicago Style (17th ed.) Citation

Weisgall, Hugo, Ben Weber, and W. B. Yeats. Purgatory: Opera in One Act. Bryn Mawr, Pennsylvania: Merion Music, 1959.

MLA (9th ed.) Citation

Weisgall, Hugo, et al. Purgatory: Opera in One Act. Merion Music, 1959.