MLA

Edwards, Jonathan, 1703-1758. Billings, Mr. and Mrs. Charles to Dea. Edwards, Miss Edwards and Marilla Clapp, wedding invitation. Box 28, folder 1540. 1831 Oct 26. https://collections.library.yale.edu/catalog/11403817.

APA, 6th edition

Edwards, Jonathan, 1703-1758. (["Box 28, folder 1540"])(1831 Oct 26)[Billings, Mr. and Mrs. Charles to Dea. Edwards, Miss Edwards and Marilla Clapp, wedding invitation]. https://collections.library.yale.edu/catalog/11403817.