Cite

[Portrait of Maria Churchill] [art original].

MLA

[Portrait of Maria Churchill] [Art Original]. 1787. https://collections.library.yale.edu/catalog/33111576.

APA, 6th edition

[Portrait of Maria Churchill] [art original]. (1787). [Miniatures (Paintings), Portrait paintings, Oil paintings (visual works)]. https://collections.library.yale.edu/catalog/33111576.