MLA

Wilson, Edmund, 1895-1972. Kimball, Caroline Knox with Hartshorne, Esther Kimball; and Kimball, Alexander (children). Box 199, folder 4849. n.d.. https://collections.library.yale.edu/catalog/16593719.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 199, folder 4849"])(n.d.)[Kimball, Caroline Knox with Hartshorne, Esther Kimball; and Kimball, Alexander (children)]. https://collections.library.yale.edu/catalog/16593719.