MLA

Matthias, Blanche (1887-1983). Pessin, Samuel. Box 3, folder 84. 1923, n.d.. https://collections.library.yale.edu/catalog/17170703.

APA, 6th edition

Matthias, Blanche (1887-1983). (["Box 3, folder 84"])(1923, n.d.)[Pessin, Samuel]. https://collections.library.yale.edu/catalog/17170703.