MLA

Steinberg, Saul, 1914-1999. Fragments from a printed advertisement for Egyptian bag manufacturing company Riad Baqtar. Box 60, folder 1093. undated. https://collections.library.yale.edu/catalog/32454970.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 60, folder 1093"])(undated)[Fragments from a printed advertisement for Egyptian bag manufacturing company Riad Baqtar]. https://collections.library.yale.edu/catalog/32454970.