MLA

Stein, Gertrude, 1874-1946. Manguin, Henri. Box 116, folder 2430. 1907-09. https://collections.library.yale.edu/catalog/2017247.

APA, 6th edition

Stein, Gertrude, 1874-1946. (["Box 116, folder 2430"])(1907-09)[Manguin, Henri]. https://collections.library.yale.edu/catalog/2017247.