Cite

[Unknown lady in white and blue dress with pearls in her hair] [art original].

MLA

Shelley, Samuel, approximately 1750-1808, artist. [Unknown lady in white and blue dress with pearls in her hair] [art original].. 1770.. https://collections.library.yale.edu/catalog/15815234.

APA, 6th edition

Shelley, Samuel, approximately 1750-1808, artist. (1770.)[[Unknown lady in white and blue dress with pearls in her hair] [art original].]. https://collections.library.yale.edu/catalog/15815234.