MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Cooperative Mural Workshops. Seven murals. Box 74, folder 1925. n.d.. https://collections.library.yale.edu/catalog/16694455.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 74, folder 1925"])(n.d.)[Cooperative Mural Workshops. Seven murals]. https://collections.library.yale.edu/catalog/16694455.