Cite

Untitled [Gray spiral-bound "GVARRO Dibujo Lapiz" sketchbook]

MLA

Steinberg, Saul, 1914-1999. Untitled [Gray spiral-bound "GVARRO Dibujo Lapiz" sketchbook]. Box 348, folder 4755. undated. https://collections.library.yale.edu/catalog/2016836.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 348, folder 4755"])(undated)[Untitled [Gray spiral-bound "GVARRO Dibujo Lapiz" sketchbook]]. https://collections.library.yale.edu/catalog/2016836.