MLA

Edwards, Jonathan, 1703-1758. 9. 1753 Apr. JE. Transcript of a letter to Master Timothy Edwards, in an unidentified hand.. Box 6, folder 241. 1753 April. https://collections.library.yale.edu/catalog/33307244.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 6, folder 241"])(1753 April)[9. 1753 Apr. JE. Transcript of a letter to Master Timothy Edwards, in an unidentified hand.]. https://collections.library.yale.edu/catalog/33307244.