"C" general
MLA
MacDonald, George, 1824-1905. "C" general. Box 1, folder 51. 1867-85. https://collections.library.yale.edu/catalog/17297721.
APA, 6th edition
MacDonald, George, 1824-1905. (["Box 1, folder 51"])(1867-85)["C" general]. https://collections.library.yale.edu/catalog/17297721.