Four new volumes have been added to the Sương Nguyệt Ánh Collection:

• Grout, Donald Jay, and Hermine Weigel Williams. A Short History Of Opera. 4th ed., New York, 2003.
• Plaut, Eric A. Grand Opera: Mirror Of the Western Mind. Chicago, 1993.
• Schonberg, Harold C. The Lives Of the Great Composers. New York, 1970; 3rd ed., New York, 1997.
• Simon, Henry W. 100 Great Operas and Their Stories. Garden City, New York, 1960.