MLA

Simpson, Randolph Linsly, 1927-1992. S. T. Souder, 263 King St., Charleston, SC Verso, "No 48, The Battery, Charleston, S.C." Stereograph, yellow card. Box 13, folder 702. undated. https://collections.library.yale.edu/catalog/32582745.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 702"])(undated)[S. T. Souder, 263 King St., Charleston, SC Verso, "No 48, The Battery, Charleston, S.C." Stereograph, yellow card]. https://collections.library.yale.edu/catalog/32582745.