MLA

McClintock, Walter, 1870-1949. G906a. Loading Travois.. Box 113, folder 5281. 1909 Summer. https://collections.library.yale.edu/catalog/10451059.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 113, folder 5281"])(1909 Summer)[G906a. Loading Travois.]. https://collections.library.yale.edu/catalog/10451059.