Cite

Postcard landscape [with single figure]

MLA

Steinberg, Saul, 1914-1999. Postcard landscape [with single figure]. Box 76, folder 1451. circa 1970s. https://collections.library.yale.edu/catalog/16855950.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 76, folder 1451"])(circa 1970s)[Postcard landscape [with single figure]]. https://collections.library.yale.edu/catalog/16855950.