Cite

[Portrait of the artist's daughters, Mary and Elizabeth, reading a book] [art original].

MLA

Beauclerk, Diana, Lady, 1734-1808, artist. [Portrait of the artist's daughters, Mary and Elizabeth, reading a book] [art original].. [ca. 1780?]. https://collections.library.yale.edu/catalog/15960106.

APA, 6th edition

Beauclerk, Diana, Lady, 1734-1808, artist. ([ca. 1780?])[[Portrait of the artist's daughters, Mary and Elizabeth, reading a book] [art original].]. https://collections.library.yale.edu/catalog/15960106.