MLA

Edwards, Jonathan, 1703-1758. 3. 1749 May 23. JE. Transcript of a letter to Mr. McCulloch, in an unidentified hand.. Box 4, folder 151. 1749 May 23. https://collections.library.yale.edu/catalog/33306420.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 4, folder 151"])(1749 May 23)[3. 1749 May 23. JE. Transcript of a letter to Mr. McCulloch, in an unidentified hand.]. https://collections.library.yale.edu/catalog/33306420.