MLA

Edwards, Jonathan, 1703-1758. 5. 1753 Oct 16. JE. Transcript of a letter to Mr. Bromfield, in the hand of Sereno E. Dwight.. Box 6, folder 237. 1753 October 16. https://collections.library.yale.edu/catalog/33307202.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 6, folder 237"])(1753 October 16)[5. 1753 Oct 16. JE. Transcript of a letter to Mr. Bromfield, in the hand of Sereno E. Dwight.]. https://collections.library.yale.edu/catalog/33307202.