Cite

Sentry with refugee prisoners...Ft. Bliss, Tex. no. 18

MLA

Trenkle, Charles, Cpl. Sentry with refugee prisoners...Ft. Bliss, Tex. no. 18. Folder 28. [1915 or 1916]. https://collections.library.yale.edu/catalog/2017151.

APA, 6th edition

Trenkle, Charles, Cpl. (["Folder 28"])([1915 or 1916])[Sentry with refugee prisoners...Ft. Bliss, Tex. no. 18]. https://collections.library.yale.edu/catalog/2017151.