MLA

Backus, Isaac, 1724-1806. Collected papers. box 9, folder 10. 1770 November 15–1770 November 24. https://collections.library.yale.edu/catalog/33571926.

APA, 6th edition

Backus, Isaac, 1724-1806. (["box 9, folder 10"])(1770 November 15–1770 November 24)[Collected papers]. https://collections.library.yale.edu/catalog/33571926.