MLA

Hawthorne, Nathaniel, 1804-1864. Mitchell, Maria. Box 2, folder 49. n.d.. https://collections.library.yale.edu/catalog/2064564.

APA, 6th edition

Hawthorne, Nathaniel, 1804-1864. (["Box 2, folder 49"])(n.d.)[Mitchell, Maria]. https://collections.library.yale.edu/catalog/2064564.