MLA

Barbour, Margaret Hart. Chinese Catechist, Ming Ho, China, Ca. 1923. 1923. https://collections.library.yale.edu/catalog/11420959.

APA, 6th edition

Barbour, M. H. (1923). Chinese catechist, Ming Ho, China, ca. 1923 [Photographs (AAT), portraits (AAT)]. https://collections.library.yale.edu/catalog/11420959.