"N-R" General
MLA
Steinberg, Saul, 1914-1999. "N-R" General. Box 55, folder 997. 1956-1996, undated. https://collections.library.yale.edu/catalog/2016635.
APA, 6th edition
Steinberg, Saul, 1914-1999. (["Box 55, folder 997"])(1956-1996, undated)["N-R" General]. https://collections.library.yale.edu/catalog/2016635.