MLA

Steinberg, Saul, 1914-1999. Walker Art Center Steinberg's America, photocopies of Steinberg works arranged by category. Box 97, folder 2086-2093. 1981. https://collections.library.yale.edu/catalog/2013096.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 97, folder 2086-2093"])(1981)[Walker Art Center Steinberg's America, photocopies of Steinberg works arranged by category]. https://collections.library.yale.edu/catalog/2013096.