In my works-cited-list entry, how do I give the title of a foreign work that is provided on the title page in both English and the original language?

Note: This post relates to content in the eighth edition of the MLA Handbook. For up-to-date guidance, see the ninth edition of the MLA Handbook.

When referring to a work in a bilingual volume in which titles appear in both languages, give both titles and interpolate a slash between them. The slash has a space on each side when the title on either side contains a space:

Leopardi, Giacomo. “Storia del genere umano / History of the Human Race.” Operette morali / Essays and Dialogues, translated and introduced by Giovanni Cecchetti, U of California P, 1982, pp. 22-55.