MLA

McClintock, Walter, 1870-1949. SF-319. Evening Sunset on River. Low Marshy Ground. Home of Beaver. Willows, Alder, Reeds, and Water Lilies.. Box 146, folder 7758. undated. https://collections.library.yale.edu/catalog/10453904.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 146, folder 7758"])(undated)[SF-319. Evening Sunset on River. Low Marshy Ground. Home of Beaver. Willows, Alder, Reeds, and Water Lilies.]. https://collections.library.yale.edu/catalog/10453904.