MLA

McClintock, Walter, 1870-1949. 202. [Two Blackfeet Tipis.]. Box 61, folder 3030. 1938. https://collections.library.yale.edu/catalog/2008475.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 61, folder 3030"])(1938)[202. [Two Blackfeet Tipis.]]. https://collections.library.yale.edu/catalog/2008475.