G569. Picketing Horses, Prairie, Sunset Rays.
MLA
McClintock, Walter, 1870-1949. G569. Picketing Horses, Prairie, Sunset Rays.. Box 105, folder 4889. 1905 Summer. https://collections.library.yale.edu/catalog/10450634.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 105, folder 4889"])(1905 Summer)[G569. Picketing Horses, Prairie, Sunset Rays.]. https://collections.library.yale.edu/catalog/10450634.