APA-referens (7:e uppl.)

Bellini, V., West, W., & Romani, F. (1840). Norma: A lyric tragic opera in two acts (Duncombe's ed.). Printed and published by J. Duncombe.

Chicago-referens (17:e uppl.)

Bellini, Vincenzo, W. West, och Felice Romani. Norma: A Lyric Tragic Opera in Two Acts. Duncombe's ed. London: Printed and published by J. Duncombe, 1840.

MLA-referens (8:e uppl.)

Bellini, Vincenzo, et al. Norma: A Lyric Tragic Opera in Two Acts. Duncombe's ed. Printed and published by J. Duncombe, 1840.