[Self-portrait] [art original].
MLA
Liotard, Jean-Etienne, 1702-1789, artist. [Self-portrait] [art original].. [ca. 1780]. https://collections.library.yale.edu/catalog/15815209.
APA, 6th edition
Liotard, Jean-Etienne, 1702-1789, artist. ([ca. 1780])[[Self-portrait] [art original].]. https://collections.library.yale.edu/catalog/15815209.