MLA

MacDonald, George, 1824-1905. MacDonald gravesites. Box 16, folder 433. n.d.. https://collections.library.yale.edu/catalog/2053339.

APA, 6th edition

MacDonald, George, 1824-1905. (["Box 16, folder 433"])(n.d.)[MacDonald gravesites]. https://collections.library.yale.edu/catalog/2053339.