MLA

MacLeish, Archibald, 1892-1982. Galantière, Louis. Box 18, folder 356. 1928 Nov 15. https://collections.library.yale.edu/catalog/17166961.

APA, 6th edition

MacLeish, Archibald, 1892-1982. (["Box 18, folder 356"])(1928 Nov 15)[Galantière, Louis]. https://collections.library.yale.edu/catalog/17166961.