MLA

Backus, Isaac, 1724-1806. Collected papers. box 9, folder 22. 1771 October 28–1771 November. https://collections.library.yale.edu/catalog/33576599.

APA, 6th edition

Backus, Isaac, 1724-1806. (["box 9, folder 22"])(1771 October 28–1771 November)[Collected papers]. https://collections.library.yale.edu/catalog/33576599.