Παραπομπή σε μορφή APA (7η εκδ.)

Verdi, G. (1848). I Lombardi alla prima crociata =: The Lombards at the first crusade : a tragic opera in four acts. J. Douglas.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Verdi, Giuseppe. I Lombardi Alla Prima Crociata =: The Lombards at the First Crusade : A Tragic Opera in Four Acts. New York: J. Douglas, 1848.

Παραπομπή σε μορφή MLA (8th εκδ.)

Verdi, Giuseppe. I Lombardi Alla Prima Crociata =: The Lombards at the First Crusade : A Tragic Opera in Four Acts. J. Douglas, 1848.