MLA

McClintock, Walter, 1870-1949. F834c. Sham Battle on Foot. Line of Warriors Waiting to Charge. Powder Bull, Morning Eagle, Little Dog, Stingy.. Box 140, folder 6807. 1908. https://collections.library.yale.edu/catalog/10452494.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 140, folder 6807"])(1908)[F834c. Sham Battle on Foot. Line of Warriors Waiting to Charge. Powder Bull, Morning Eagle, Little Dog, Stingy.]. https://collections.library.yale.edu/catalog/10452494.