MLA

Barbour, George B. (George Brown), 1890-1977. Building under construction, Yenching University campus, Beijing, China, 1926. Box 19 | Folder 2. 1926. https://collections.library.yale.edu/catalog/11420920.

APA, 6th edition

Barbour, George B. (George Brown), 1890-1977. (["Box 19 | Folder 2"])(1926)[Building under construction, Yenching University campus, Beijing, China, 1926]. https://collections.library.yale.edu/catalog/11420920.