MLA

Backus, Isaac, 1724-1806. Collected papers. box 8, folder 24. 1767 January–1767 April. https://collections.library.yale.edu/catalog/33555764.

APA, 6th edition

Backus, Isaac, 1724-1806. (["box 8, folder 24"])(1767 January–1767 April)[Collected papers]. https://collections.library.yale.edu/catalog/33555764.