MLA

Stiles, Ezra, 1727-1795. Unidentified author. Notes on population of Boston, Massachusetts (MVP #374). Box 51, folder 2139. 1765 August 5. https://collections.library.yale.edu/catalog/16846388.

APA, 6th edition

Stiles, Ezra, 1727-1795. (["Box 51, folder 2139"])(1765 August 5)[Unidentified author. Notes on population of Boston, Massachusetts (MVP #374)]. https://collections.library.yale.edu/catalog/16846388.