MLA

Edwards, Jonathan, 1703-1758. 6. 1747 Jan 21. JE. Transcript of a letter to William McCulloch, in an unidentified hand.. Box 4, folder 140. 1747 January 21. https://collections.library.yale.edu/catalog/33306293.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 4, folder 140"])(1747 January 21)[6. 1747 Jan 21. JE. Transcript of a letter to William McCulloch, in an unidentified hand.]. https://collections.library.yale.edu/catalog/33306293.