MLA

Stein, Gertrude, 1874-1946. Laughlin, James. Box 114, folder 2356. 1934-[45?]. https://collections.library.yale.edu/catalog/17105749.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 114, folder 2356"])(1934-[45?])[Laughlin, James]. https://collections.library.yale.edu/catalog/17105749.