MLA

McClintock, Walter, 1870-1949. 904. Painting Necklace.. Box 68, folder 3711. undated. https://collections.library.yale.edu/catalog/2009888.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 68, folder 3711"])(undated)[904. Painting Necklace.]. https://collections.library.yale.edu/catalog/2009888.