MLA

Hilles, Frederick W. (Frederick Whiley), 1900-1975. Hogarth, Jane. Box 9, folder 258. 1781 May 29. https://collections.library.yale.edu/catalog/17475204.

APA, 6th edition

Hilles, Frederick W. (Frederick Whiley), 1900-1975. (["Box 9, folder 258"])(1781 May 29)[Hogarth, Jane]. https://collections.library.yale.edu/catalog/17475204.