Suleiman Saleh, Azher. “The Threepenny Opera: The Ballad Opera and the Socio-Political Criticism and Change”. Adab Al-Rafidayn 41, no. 59 (January 1, 2000): 28–55. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/radab/article/view/33917.