MLA

of Romans, Humbert. Liber Constitutionem Sororum O.P. (Fragment). 0AD. https://collections.library.yale.edu/catalog/2004064.

APA, 6th edition

of Romans, H. (0 C.E.). Liber Constitutionem Sororum O.P. (fragment). [Manuscripts, Medieval Germany 13th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/2004064.