MLA

McClintock, Walter, 1870-1949. G787. Park. Head of Canyon. Northwest. Mountain at Forks. Showing High Timber.. Box 108, folder 5052. 1906 Fall. https://collections.library.yale.edu/catalog/10450813.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 108, folder 5052"])(1906 Fall)[G787. Park. Head of Canyon. Northwest. Mountain at Forks. Showing High Timber.]. https://collections.library.yale.edu/catalog/10450813.