I PET. 1:15: "That Christians are..."
MLA
Edwards, Jonathan, 1703-1758. I PET. 1:15: "That Christians are...". Box 14, folder 1133-1134. n.d.. https://collections.library.yale.edu/catalog/10689270.
APA, 6th edition
Edwards, Jonathan, 1703-1758. (["Box 14, folder 1133-1134"])(n.d.)[I PET. 1:15: "That Christians are..."]. https://collections.library.yale.edu/catalog/10689270.