Cite

[Portrait of a lady seated on a terrace, with a dog at her side] [art original].

MLA

Beauclerk, Diana, Lady, 1734-1808, artist. [Portrait of a lady seated on a terrace, with a dog at her side] [art original].. 1788.. https://collections.library.yale.edu/catalog/16229178.

APA, 6th edition

Beauclerk, Diana, Lady, 1734-1808, artist. (1788.)[[Portrait of a lady seated on a terrace, with a dog at her side] [art original].]. https://collections.library.yale.edu/catalog/16229178.