MLA

McClintock, Walter, 1870-1949. 659. [Country of the Northern Piegan. Oldman River in Southern Alberta, Canada.]. Box 64, folder 3384. 1939. https://collections.library.yale.edu/catalog/2009017.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 64, folder 3384"])(1939)[659. [Country of the Northern Piegan. Oldman River in Southern Alberta, Canada.]]. https://collections.library.yale.edu/catalog/2009017.