MLA

Scheuer, Steven H., 1926-2014. with Margaret Truman. Box 426, folder 13. 1959 Nov 9. https://collections.library.yale.edu/catalog/17101457.

APA, 6th edition

Scheuer, Steven H., 1926-2014. (["Box 426, folder 13"])(1959 Nov 9)[with Margaret Truman]. https://collections.library.yale.edu/catalog/17101457.