G643. Two Herders on Horseback.
MLA
McClintock, Walter, 1870-1949. G643. Two Herders on Horseback.. Box 106, folder 4955. 1906 Spring. https://collections.library.yale.edu/catalog/10450707.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 106, folder 4955"])(1906 Spring)[G643. Two Herders on Horseback.]. https://collections.library.yale.edu/catalog/10450707.