Cite

[Dad's pack outfit, he is center with the vest]

MLA

[Dad's Pack Outfit, He Is Center with the Vest]. 1911. https://collections.library.yale.edu/catalog/2013701.

APA, 6th edition

[Dad's pack outfit, he is center with the vest]. (1911). [Photographic prints, Photographs, Snapshots]. https://collections.library.yale.edu/catalog/2013701.