Cite

GS-114. Rattler, the Doctor, on Horseback.

MLA

McClintock, Walter, 1870-1949. GS-114. Rattler, the Doctor, on Horseback.. Box 122, folder 5707. undated. https://collections.library.yale.edu/catalog/10453434.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 122, folder 5707"])(undated)[GS-114. Rattler, the Doctor, on Horseback.]. https://collections.library.yale.edu/catalog/10453434.