MLA

Laer, F. von, 19th century, printmaker. Der Gesundbrunnen bei Freienwalde [graphic]. [19th century]. https://collections.library.yale.edu/catalog/17338294.

APA, 6th edition

Laer, F. von, 19th century, printmaker. ([19th century])[Der Gesundbrunnen bei Freienwalde [graphic]]. https://collections.library.yale.edu/catalog/17338294.