MLA

Archiquette, John, 1847-1923. Archiquette, John to Morgan, Thomas Jefferson. Box 2, folder 22. 1890 March 29. https://collections.library.yale.edu/catalog/16715378.

APA, 6th edition

Archiquette, John, 1847-1923. (["Box 2, folder 22"])(1890 March 29)[Archiquette, John to Morgan, Thomas Jefferson]. https://collections.library.yale.edu/catalog/16715378.