SF-272. Winter. Forest. Snowshoes. [Walter McClintock]
MLA
McClintock, Walter, 1870-1949. SF-272. Winter. Forest. Snowshoes. [Walter McClintock]. Box 146, folder 7712. undated. https://collections.library.yale.edu/catalog/10453857.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 146, folder 7712"])(undated)[SF-272. Winter. Forest. Snowshoes. [Walter McClintock]]. https://collections.library.yale.edu/catalog/10453857.