MLA

Edwards, Jonathan, 1703-1758. 3. 1741 Sep 18. Unidentified. Letter to "Revd & Worthy Gentlemen." Probably a draft.. Box 4, folder 118. 1741 September 18. https://collections.library.yale.edu/catalog/33305995.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 4, folder 118"])(1741 September 18)[3. 1741 Sep 18. Unidentified. Letter to "Revd & Worthy Gentlemen." Probably a draft.]. https://collections.library.yale.edu/catalog/33305995.