MLA

Missionary Couple, Kabalo, Congo, 1953. 1920. https://collections.library.yale.edu/catalog/11454933.

APA, 6th edition

Missionary couple, Kabalo, Congo, 1953. (1920). [Group portraits (AAT), photographic postcards (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11454933.