MLA

Hawthorne, Nathaniel, 1804-1864. Story, [William Wetmore]. Box 2, folder 52. 1860 Apr 15. https://collections.library.yale.edu/catalog/2064567.

APA, 6th edition

Hawthorne, Nathaniel, 1804-1864. (["Box 2, folder 52"])(1860 Apr 15)[Story, [William Wetmore]]. https://collections.library.yale.edu/catalog/2064567.