Cite

6. [German caption]. Unidentified photographer.

MLA

Allsworth, Jenny. 6. [German Caption]. Unidentified Photographer. 1890. https://collections.library.yale.edu/catalog/32500165.

APA, 6th edition

Allsworth, J. (1890). 6. [German caption]. Unidentified photographer. https://collections.library.yale.edu/catalog/32500165.