MLA

Beauclerk, Diana, Lady, 1734-1808, artist. [Drawing for Book III, Canto IX, 22-23 of Edmund Spenser's Faerie queene] [art original].. [ca. 1781]. https://collections.library.yale.edu/catalog/15960379.

APA, 6th edition

Beauclerk, Diana, Lady, 1734-1808, artist. ([ca. 1781])[[Drawing for Book III, Canto IX, 22-23 of Edmund Spenser's Faerie queene] [art original].]. https://collections.library.yale.edu/catalog/15960379.