MLA

Wolff, Helen, 1906-1994. Reader reports. Box 63, folder 1830. 1961, n.d.. https://collections.library.yale.edu/catalog/10460170.

APA, 6th edition

Wolff, Helen, 1906-1994. (["Box 63, folder 1830"])(1961, n.d.)[Reader reports]. https://collections.library.yale.edu/catalog/10460170.