MLA

Wilson, Edmund, 1895-1972. Kimball, Reuel, Dr., with Hartshorne, Esther Kimball; Kimball, Alexander (children); and Kimball, Caroline Knox. Box 199, folder 4856. n.d.. https://collections.library.yale.edu/catalog/16593720.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 199, folder 4856"])(n.d.)[Kimball, Reuel, Dr., with Hartshorne, Esther Kimball; Kimball, Alexander (children); and Kimball, Caroline Knox]. https://collections.library.yale.edu/catalog/16593720.