MLA

Lewis, Sinclair, 1885-1951. Raphaelson, Samuel. Box 52, folder 699. 1929-1946. https://collections.library.yale.edu/catalog/32258185.

APA, 6th edition

Lewis, Sinclair, 1885-1951. (["Box 52, folder 699"])(1929-1946)[Raphaelson, Samuel]. https://collections.library.yale.edu/catalog/32258185.