MLA

Simpson, Randolph Linsly, 1927-1992. The Hament-Romans Company, Baltimore, MD "Colored Victory Boys, Camp Merritt, N.J." Postcard. Box 25. circa 1919. https://collections.library.yale.edu/catalog/16172720.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 25"])(circa 1919)[The Hament-Romans Company, Baltimore, MD "Colored Victory Boys, Camp Merritt, N.J." Postcard]. https://collections.library.yale.edu/catalog/16172720.