MLA

Wilson, Edmund, 1895-1972. Cameo stick pin. Box 205, folder 5027. n.d.. https://collections.library.yale.edu/catalog/2005097.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 205, folder 5027"])(n.d.)[Cameo stick pin]. https://collections.library.yale.edu/catalog/2005097.