MLA

McClintock, Walter, 1870-1949. F876e. Lake McDonald. Box 140, folder 6914. 1908. https://collections.library.yale.edu/catalog/10452601.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 140, folder 6914"])(1908)[F876e. Lake McDonald]. https://collections.library.yale.edu/catalog/10452601.