Cite

914. [Horses and Tipis on the Prairie.]

MLA

McClintock, Walter, 1870-1949. 914. [Horses and Tipis on the Prairie.]. Box 68, folder 3723. undated. https://collections.library.yale.edu/catalog/2009900.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 68, folder 3723"])(undated)[914. [Horses and Tipis on the Prairie.]]. https://collections.library.yale.edu/catalog/2009900.