Cite

Apothecary looking into a microscope while a man looks on, Congo, ca. 1920-1940

MLA

Apothecary Looking into a Microscope While a Man Looks on, Congo, Ca. 1920-1940. 1920. https://collections.library.yale.edu/catalog/11455799.

APA, 6th edition

Apothecary looking into a microscope while a man looks on, Congo, ca. 1920-1940. (1920). [General views (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11455799.