MLA

Wilson, Edmund, 1895-1972. Swazzle. Box 204, folder 5015. n.d.. https://collections.library.yale.edu/catalog/2005094.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 204, folder 5015"])(n.d.)[Swazzle]. https://collections.library.yale.edu/catalog/2005094.