[Photograph of National Guardsmen waiting by a train]
MLA
Trenkle, Charles, Cpl. [Photograph of National Guardsmen waiting by a train]. Folder 28. [1916 or 1917]. https://collections.library.yale.edu/catalog/2017145.
APA, 6th edition
Trenkle, Charles, Cpl. (["Folder 28"])([1916 or 1917])[[Photograph of National Guardsmen waiting by a train]]. https://collections.library.yale.edu/catalog/2017145.