Cite

A history of New England...: Manuscript of abridgement

MLA

Backus, Isaac, 1724-1806. A history of New England...: Manuscript of abridgement. Box 4, folder 6-7. Undated. https://collections.library.yale.edu/catalog/33543105.

APA, 6th edition

Backus, Isaac, 1724-1806. (["Box 4, folder 6-7"])(Undated)[A history of New England...: Manuscript of abridgement]. https://collections.library.yale.edu/catalog/33543105.