SF-257. Horse Herd Feeding. Camp in Rockies.
MLA
McClintock, Walter, 1870-1949. SF-257. Horse Herd Feeding. Camp in Rockies.. Box 146, folder 7697. undated. https://collections.library.yale.edu/catalog/10453842.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 146, folder 7697"])(undated)[SF-257. Horse Herd Feeding. Camp in Rockies.]. https://collections.library.yale.edu/catalog/10453842.