MLA

Kissinger, Henry, 1923-2023. Pittsburgh speech notes. Box 254, folder 7. Undated, circa 1955-circa 1968. https://collections.library.yale.edu/catalog/11786646.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 254, folder 7"])(Undated, circa 1955-circa 1968)[Pittsburgh speech notes]. https://collections.library.yale.edu/catalog/11786646.