Cite

[Younger son of the honourable Thomas Erskine] [art original].

MLA

Trail, Ann Agnes, and artist. [Younger Son of the Honourable Thomas Erskine] [Art Original]. 1832. https://collections.library.yale.edu/catalog/15815247.

APA, 6th edition

Trail, A. A., & artist. (1832). [Younger son of the honourable Thomas Erskine] [art original]. [Portraits British 18th century, Watercolors British 18th century, Paintings British 18th century]. https://collections.library.yale.edu/catalog/15815247.