Donizetti, G., Bidera, G. E., & Révoil, B. H. (1848). Gemma di Vergy: A tragic opera in two acts = Gemma of Vergy. J. Douglas.
Lua i Stíl Chicago (17ú heag.)Donizetti, Gaetano, Giovanni Emanuele Bidera, agus Bénédict Henry Révoil. Gemma Di Vergy: A Tragic Opera in Two Acts = Gemma of Vergy. New York: J. Douglas, 1848.
Lua MLA (8ú heag.)Donizetti, Gaetano, et al. Gemma Di Vergy: A Tragic Opera in Two Acts = Gemma of Vergy. J. Douglas, 1848.
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