Cite

Portfolio #2, 1918-29 (in Series V)

MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Portfolio #2, 1918-29 (in Series V). Box 124, folder 2868. n.d.. https://collections.library.yale.edu/catalog/2040550.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 124, folder 2868"])(n.d.)[Portfolio #2, 1918-29 (in Series V)]. https://collections.library.yale.edu/catalog/2040550.