MLA

Simpson, Randolph Linsly, 1927-1992. Studio unknown View of tent in field; four Civil War soldiers with stacked rifles and posted sentry. Carte de visite. Box 11, folder 419. circa 1864. https://collections.library.yale.edu/catalog/2003911.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 11, folder 419"])(circa 1864)[Studio unknown View of tent in field; four Civil War soldiers with stacked rifles and posted sentry. Carte de visite]. https://collections.library.yale.edu/catalog/2003911.