MLA

Steinberg, Saul, 1914-1999. Robert Delpire Editeur. Box 38, folder 707-708. 1953-1975, undated. https://collections.library.yale.edu/catalog/10544409.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 38, folder 707-708"])(1953-1975, undated)[Robert Delpire Editeur]. https://collections.library.yale.edu/catalog/10544409.