MLA

McAdoo, Orpheus M. (Orpheus Myron), 1858-1900. Wedding invitation, Orpheus and Mattie McAdoo. Box 3, folder 26. 1891. https://collections.library.yale.edu/catalog/10171447.

APA, 6th edition

McAdoo, Orpheus M. (Orpheus Myron), 1858-1900. (["Box 3, folder 26"])(1891)[Wedding invitation, Orpheus and Mattie McAdoo]. https://collections.library.yale.edu/catalog/10171447.