MLA

Bentley, R. (Richard), 1708-1782, artist. Designs for Gothic benches & chairs at Strawberry Hill by Mr. Bentley [art original].. [approximately 1754]. https://collections.library.yale.edu/catalog/16193323.

APA, 6th edition

Bentley, R. (Richard), 1708-1782, artist. ([approximately 1754])[Designs for Gothic benches & chairs at Strawberry Hill by Mr. Bentley [art original].]. https://collections.library.yale.edu/catalog/16193323.