MLA

MacDonald, George, 1824-1905. MacDonald family album. Box 15, folder 425. n.d.. https://collections.library.yale.edu/catalog/2012448.

APA, 6th edition

MacDonald, George, 1824-1905. (["Box 15, folder 425"])(n.d.)[MacDonald family album]. https://collections.library.yale.edu/catalog/2012448.