MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Inside hall, showing Brancusi's "Yellow Bird"; Library, showing Marcel Duchamp's "Tum'" and "Bride stripped bare by her bachelors, even" (4 prints, 2 proofs); Library, close-up of Marcel Duchamp's "Tu m'" (2 versions, 5 prints); Library, showing fireplace. Box 70, folder 1809. undated. https://collections.library.yale.edu/catalog/2043644.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 70, folder 1809"])(undated)[Inside hall, showing Brancusi's "Yellow Bird"; Library, showing Marcel Duchamp's "Tum'" and "Bride stripped bare by her bachelors, even" (4 prints, 2 proofs); Library, close-up of Marcel Duchamp's "Tu m'" (2 versions, 5 prints); Library, showing fireplace]. https://collections.library.yale.edu/catalog/2043644.