MLA

McAdoo, Orpheus M. (Orpheus Myron), 1858-1900. Miscellaneous. Box 2, folder 21. circa 1860-1960. https://collections.library.yale.edu/catalog/17028279.

APA, 6th edition

McAdoo, Orpheus M. (Orpheus Myron), 1858-1900. (["Box 2, folder 21"])(circa 1860-1960)[Miscellaneous]. https://collections.library.yale.edu/catalog/17028279.