MLA

Edwards, Jonathan, 1703-1758. 1. 1719 Jun 30. Cutler, Timothy. ALS to "Revd Sr" [Timothy Edwards] about JE and Isaac Stiles.. Box 3, folder 71. 1790 June 30. https://collections.library.yale.edu/catalog/33305520.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 3, folder 71"])(1790 June 30)[1. 1719 Jun 30. Cutler, Timothy. ALS to "Revd Sr" [Timothy Edwards] about JE and Isaac Stiles.]. https://collections.library.yale.edu/catalog/33305520.