MLA

MacDonald, George, 1824-1905. Oakey, Maria (Dewing). Box 2, folder 114. 1873-74. https://collections.library.yale.edu/catalog/17297732.

APA, 6th edition

MacDonald, George, 1824-1905. (["Box 2, folder 114"])(1873-74)[Oakey, Maria (Dewing)]. https://collections.library.yale.edu/catalog/17297732.