MLA

Wilson, Edmund, 1895-1972. Christmas greeting on glass plate. Box 205, folder 5028. n.d.. https://collections.library.yale.edu/catalog/2005098.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 205, folder 5028"])(n.d.)[Christmas greeting on glass plate]. https://collections.library.yale.edu/catalog/2005098.