La Gioconda, an opera in four actsGioconda. Libretto. English

Chicago citation style
Ponchielli, Amilcare, 1834-1886. La Gioconda, an opera in four acts,Gioconda. Libretto. English. c1884. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006221258. (Accessed November 15, 2018.)
APA citation style
Ponchielli, Amilcare, 1834-1886, (c1884) La Gioconda, an opera in four acts,Gioconda. Libretto. English. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/006221258
MLA citation style
Ponchielli, Amilcare, 1834-1886. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/006221258>.
Note: These citations are programmatically generated and may be incomplete.