MLA

Berthoud, H. (Henry), active 19th century, printmaker. Hôtel de la Pitié ; École Polytechnique [graphic]. [not after 1864]. https://collections.library.yale.edu/catalog/17338938.

APA, 6th edition

Berthoud, H. (Henry), active 19th century, printmaker. ([not after 1864])[Hôtel de la Pitié ; École Polytechnique [graphic]]. https://collections.library.yale.edu/catalog/17338938.