Cite

Boys watching a building being erected, Congo, ca. 1920-1940

MLA

Boys Watching a Building Being Erected, Congo, Ca. 1920-1940. 1920. https://collections.library.yale.edu/catalog/11455835.

APA, 6th edition

Boys watching a building being erected, Congo, ca. 1920-1940. (1920). [General views (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11455835.