MLA

Steinberg, Saul, 1914-1999. Untitled [China series: Saul Steinberg on horseback encountering Chinese villager]. Box 428, folder 5823. circa 1988. https://collections.library.yale.edu/catalog/33488472.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 428, folder 5823"])(circa 1988)[Untitled [China series: Saul Steinberg on horseback encountering Chinese villager]]. https://collections.library.yale.edu/catalog/33488472.