MLA

Ankwe Man on Horseback, Shendam, Nigeria, 1923. 1923. https://collections.library.yale.edu/catalog/16713916.

APA, 6th edition

Ankwe man on horseback, Shendam, Nigeria, 1923. (1923). [Photographs (AAT)]. https://collections.library.yale.edu/catalog/16713916.