Ballad opera,
by Edmond McAdoo Gagey.
APA Citation
Gagey, E. McAdoo. (1937). Ballad opera. New York: Columbia university press.
MLA Citation
Gagey, Edmond McAdoo, 1901-. Ballad Opera. New York: Columbia university press, 1937.
Warning: These citations may not always be complete (especially for serials).