APA (7th ed.) Citation

Leopold, S., & Maschka, R. (2007). Who's who in der Oper. Kleine digitale Bibliothek.

Chicago Style (17th ed.) Citation

Leopold, Silke, and Robert Maschka. "Who's Who in Der Oper." Kleine Digitale Bibliothek 2007.

MLA (9th ed.) Citation

Leopold, Silke, and Robert Maschka. "Who's Who in Der Oper." Kleine Digitale Bibliothek, 2007.

Warning: These citations may not always be 100% accurate.