Cite

[Photograph of the Powell Memorial Monument]

MLA

Bros, Kolb. [Photograph of the Powell Memorial Monument]. 1921. https://collections.library.yale.edu/catalog/2018294.

APA, 6th edition

Bros, K. (1921). [Photograph of the Powell Memorial Monument] [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2018294.