Cite

Postcard landscape sunset [with pyramid and two figures]

MLA

Steinberg, Saul, 1914-1999. Postcard landscape sunset [with pyramid and two figures]. Box 76, folder 1516. circa 1970s. https://collections.library.yale.edu/catalog/16856014.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 76, folder 1516"])(circa 1970s)[Postcard landscape sunset [with pyramid and two figures]]. https://collections.library.yale.edu/catalog/16856014.