MLA

Stein, Gertrude, 1874-1946. Jolas, Eugene. Box 112, folder 2300. 1927-31. https://collections.library.yale.edu/catalog/11672423.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 112, folder 2300"])(1927-31)[Jolas, Eugene]. https://collections.library.yale.edu/catalog/11672423.