MLA

Isidore, of Seville, Saint, d. 636. Isidori Hispalensis episcopi Originum libri viginti ex antiquitate eruti : Et Martiani Capellae De nuptijs philologiae & Mercurij libri nouem / vterque, praeter Fulgentium & Veteres grammaticos, Varijs lectionibus & scholijs illustratus opera atq[ue] industria Bonaventvrae Vvlcanii Brvgensis. [1577]. https://collections.library.yale.edu/catalog/2057275.

APA, 6th edition

Isidore, of Seville, Saint, d. 636. ([1577])[Isidori Hispalensis episcopi Originum libri viginti ex antiquitate eruti : Et Martiani Capellae De nuptijs philologiae & Mercurij libri nouem / vterque, praeter Fulgentium & Veteres grammaticos, Varijs lectionibus & scholijs illustratus opera atq[ue] industria Bonaventvrae Vvlcanii Brvgensis]. https://collections.library.yale.edu/catalog/2057275.