Cite

13. [Horses in a Field.]

MLA

McClintock, Walter, 1870-1949. 13. [Horses in a Field.]. Box 60, folder 2938. 1941. https://collections.library.yale.edu/catalog/2008354.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 60, folder 2938"])(1941)[13. [Horses in a Field.]]. https://collections.library.yale.edu/catalog/2008354.