MLA

Simpson, Randolph Linsly, 1927-1992. Unknown French photographer Three soldiers in uniform stand before house; two wear Engineer Corps badges. photographic postcard. Box 25. circa 1918. https://collections.library.yale.edu/catalog/16172745.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(circa 1918)[Unknown French photographer Three soldiers in uniform stand before house; two wear Engineer Corps badges. photographic postcard]. https://collections.library.yale.edu/catalog/16172745.