Cite

A history of New England...: Proposal for volume 2

MLA

Backus, Isaac, 1724-1806. A history of New England...: Proposal for volume 2. Box 4, folder 4. 1781. https://collections.library.yale.edu/catalog/33530617.

APA, 6th edition

Backus, Isaac, 1724-1806. (["Box 4, folder 4"])(1781)[A history of New England...: Proposal for volume 2]. https://collections.library.yale.edu/catalog/33530617.