MLA

Backus, Isaac, 1724-1806. A short description of the difference between the bond-woman and the free as they are the two covenants. Box 5, folder 9. 1770. https://collections.library.yale.edu/catalog/33530944.

APA, 6th edition

Backus, Isaac, 1724-1806. (["Box 5, folder 9"])(1770)[A short description of the difference between the bond-woman and the free as they are the two covenants]. https://collections.library.yale.edu/catalog/33530944.