Cite

He saw an apothecary on a white horse ... [graphic]

MLA

Landseer, Thomas, 1795-1880, printmaker. He saw an apothecary on a white horse ... [graphic]. [not after 1880]. https://collections.library.yale.edu/catalog/17338361.

APA, 6th edition

Landseer, Thomas, 1795-1880, printmaker. ([not after 1880])[He saw an apothecary on a white horse ... [graphic]]. https://collections.library.yale.edu/catalog/17338361.