MLA

Duchamp, Marcel, 1887-1968, Stein, Gertrude, 1874-1946. Volume 15. Box 90 | Folder 1701. ca. 1917-20. https://collections.library.yale.edu/catalog/2020774.

APA, 6th edition

Duchamp, Marcel, 1887-1968, & Stein, Gertrude, 1874-1946. (["Box 90 | Folder 1701"])(ca. 1917-20)[Volume 15]. https://collections.library.yale.edu/catalog/2020774.