MLA

Stein, Gertrude, 1874-1946. Correspondence with and about Gertrude Stein, some enclosing manuscripts of writings by GS. Box 15, folder 245-249. 1919-42. https://collections.library.yale.edu/catalog/2112311.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 15, folder 245-249"])(1919-42)[Correspondence with and about Gertrude Stein, some enclosing manuscripts of writings by GS]. https://collections.library.yale.edu/catalog/2112311.