MLA

Edwards, Jonathan, 1703-1758. 5. 1752 Aug. JE. Letter draft to Mr. Oliver, on letter cover to Mr. Edward Bromfield in Boston.. Box 6, folder 219. 1752 August. https://collections.library.yale.edu/catalog/33307037.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 6, folder 219"])(1752 August)[5. 1752 Aug. JE. Letter draft to Mr. Oliver, on letter cover to Mr. Edward Bromfield in Boston.]. https://collections.library.yale.edu/catalog/33307037.