MLA

Mrs. Elizabeth Cromwell, Mother of the Protector [Graphic]. G. G. J. and J. Robinson, 0AD. https://collections.library.yale.edu/catalog/16850858.

APA, 6th edition

Mrs. Elizabeth Cromwell, mother of the Protector [graphic]. (0 C.E.). [Book illustrations, Portrait prints, Etchings England London 1787, Engravings England London 1787, Stipple engravings England London 1787]. G. G. J. and J. Robinson. https://collections.library.yale.edu/catalog/16850858.