Cite

[Floor plan of a room] Fontainebleau window, shelf over it. [art original]

MLA

Walpole, Horace, 1717-1797, artist. [Floor plan of a room] Fontainebleau window, shelf over it. [art original]. [not after 1797]. https://collections.library.yale.edu/catalog/33207387.

APA, 6th edition

Walpole, Horace, 1717-1797, artist. ([not after 1797])[[Floor plan of a room] Fontainebleau window, shelf over it. [art original]]. https://collections.library.yale.edu/catalog/33207387.