MLA

Steinberg, Saul, 1914-1999. Buzzi, Aldo. Box 6, folder 117-122 | Box 7, folder 123-132 | Box 8, folder 133-141 | Box 366, folder 4879. 1945-1999, undated. https://collections.library.yale.edu/catalog/10034224.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 6, folder 117-122 | Box 7, folder 123-132 | Box 8, folder 133-141 | Box 366, folder 4879"])(1945-1999, undated)[Buzzi, Aldo]. https://collections.library.yale.edu/catalog/10034224.