MLA

Three Small Children, Zambia, Ca. 1920-1940. 1920. https://collections.library.yale.edu/catalog/11447482.

APA, 6th edition

Three small children, Zambia, ca. 1920-1940. (1920). [Group portraits (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11447482.