MLA

Mickle, William Julius, 1735-1788. Mickle, Charles (?-1768). Box 2, folder 87. 1762 November 1. https://collections.library.yale.edu/catalog/16684786.

APA, 6th edition

Mickle, William Julius, 1735-1788. (["Box 2, folder 87"])(1762 November 1)[Mickle, Charles (?-1768)]. https://collections.library.yale.edu/catalog/16684786.