MLA

Bowen, Croswell, 1905-1971. Sketches. Box 5, folder 123. 1925, n.d.. https://collections.library.yale.edu/catalog/2053071.

APA, 6th edition

Bowen, Croswell, 1905-1971. (["Box 5, folder 123"])(1925, n.d.)[Sketches]. https://collections.library.yale.edu/catalog/2053071.