MLA

Stein, Gertrude, 1874-1946. Lynes, George Platt. Box 10, folder 136a. 1925-34. https://collections.library.yale.edu/catalog/10723637.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 10, folder 136a"])(1925-34)[Lynes, George Platt]. https://collections.library.yale.edu/catalog/10723637.