MLA

Barbour, Margaret Hart. Students of St Mary's School Preparing to Leave for Memorial Service, Shanghai, China, Ca. 1922. 1922. https://collections.library.yale.edu/catalog/11420970.

APA, 6th edition

Barbour, M. H. (1922). Students of St Mary's school preparing to leave for memorial service, Shanghai, China, ca. 1922 [Group portraits (AAT), photographs (AAT)]. https://collections.library.yale.edu/catalog/11420970.