"The Elizabeth Duncan School," typescript carbon
MLA
Dreier, Katherine S. (Katherine Sophie), 1877-1952. "The Elizabeth Duncan School," typescript carbon. Box 42, folder 1232. n.d.. https://collections.library.yale.edu/catalog/16694435.
APA, 6th edition
Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 42, folder 1232"])(n.d.)["The Elizabeth Duncan School," typescript carbon]. https://collections.library.yale.edu/catalog/16694435.