MLA

Backus, Isaac, 1724-1806. Collected papers. box 9, folder 32. 1772 October 22–1772 November. https://collections.library.yale.edu/catalog/33579715.

APA, 6th edition

Backus, Isaac, 1724-1806. (["box 9, folder 32"])(1772 October 22–1772 November)[Collected papers]. https://collections.library.yale.edu/catalog/33579715.