MLA

Williams, Charles, active 1797-1830, printmaker. The guide to health, or, Bonnell Thornton's consultation of physicians [graphic].. [approximately 1810]. https://collections.library.yale.edu/catalog/10967946.

APA, 6th edition

Williams, Charles, active 1797-1830, printmaker. ([approximately 1810])[The guide to health, or, Bonnell Thornton's consultation of physicians [graphic].]. https://collections.library.yale.edu/catalog/10967946.