APA (7th ed.) Citation

Allegri, R., & Allegri, R. (1998). Callas by Callas: The secret writings of "la Maria". Universe.

Chicago Style (17th ed.) Citation

Allegri, Renzo, and Roberto Allegri. Callas by Callas: The Secret Writings of "La Maria". New York: Universe, 1998.

MLA (9th ed.) Citation

Allegri, Renzo, and Roberto Allegri. Callas by Callas: The Secret Writings of "La Maria". Universe, 1998.