APA (7th ed.) Citation

Ardoin, J., Callas, M., Zeffirelli, F., Weinberg, P., & Swank, P. (1978). Callas: A documentary. Bel Canto Society.

Chicago Style (17th ed.) Citation

Ardoin, John, Maria Callas, Franco Zeffirelli, Peter Weinberg, and Patsy Swank. Callas: A Documentary. [Place of publication not identified]: Bel Canto Society, 1978.

MLA (9th ed.) Citation

Ardoin, John, et al. Callas: A Documentary. Bel Canto Society, 1978.