MLA

Her Most Gracious Majesty Caroline, Queen of England [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/33111680.

APA, 6th edition

Her Most Gracious Majesty Caroline, Queen of England [graphic]. (0 C.E.). [Cloth prints, Portrait prints, Engravings England 1820, Etchings England 1820]. publisher not identified. https://collections.library.yale.edu/catalog/33111680.