MLA

McClintock, Walter, 1870-1949. 671. [Great Grandchildren of Brings-Down-The-Sun (Natóssin-nepee) with their Mother and Family Dog, Kopaksisse.]. Box 64, folder 3396. 1939. https://collections.library.yale.edu/catalog/2009030.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 64, folder 3396"])(1939)[671. [Great Grandchildren of Brings-Down-The-Sun (Natóssin-nepee) with their Mother and Family Dog, Kopaksisse.]]. https://collections.library.yale.edu/catalog/2009030.