Cite

[Visionary heads, or Two types of insanity] [art original].

MLA

Blake, William, 1757-1827, artist. [Visionary heads, or Two types of insanity] [art original].. [between 1819 and 1820]. https://collections.library.yale.edu/catalog/17340004.

APA, 6th edition

Blake, William, 1757-1827, artist. ([between 1819 and 1820])[[Visionary heads, or Two types of insanity] [art original].]. https://collections.library.yale.edu/catalog/17340004.