MLA

Cavendish, Jane, and Lady. [Poems], [Mid 17th Century]. 0AD. https://collections.library.yale.edu/catalog/2021030.

APA, 6th edition

Cavendish, J., & L. (0 C.E.). [Poems], [mid 17th century] [Authors' inscriptions, Manuscripts, Poems, Watermakers (Paper)]. https://collections.library.yale.edu/catalog/2021030.