MLA

Steinberg, Saul, 1914-1999. Drawings and sketches. Box 60, folder 1105. undated. https://collections.library.yale.edu/catalog/32455072.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 60, folder 1105"])(undated)[Drawings and sketches]. https://collections.library.yale.edu/catalog/32455072.