[The little gray man] [art original]
MLA
Greatheed, Bertie, 1759-1826, artist. [The little gray man] [art original]. [1801]. https://collections.library.yale.edu/catalog/15960395.
APA, 6th edition
Greatheed, Bertie, 1759-1826, artist. ([1801])[[The little gray man] [art original]]. https://collections.library.yale.edu/catalog/15960395.