MLA

Mary of Guise from a Painting in the Duke of Devonshire's Possession / [Graphic]. Published 1st December 1794 by I. Herbert, No. 29 Great Russel Street, Bloomsbury, 0AD. https://collections.library.yale.edu/catalog/16193118.

APA, 6th edition

Mary of Guise from a painting in the Duke of Devonshire's possession / [graphic]. (0 C.E.). [Book illustrations, Portrait prints, Stipple engravings England London 1794, Etchings England London 1794]. Published 1st December 1794 by I. Herbert, No. 29 Great Russel Street, Bloomsbury. https://collections.library.yale.edu/catalog/16193118.