MLA

Kissinger, Henry, 1923-2023. Genscher, Hans Dietrich with Kissinger. Box 227, folder 35. Undated, circa 1967-circa 2009. https://collections.library.yale.edu/catalog/12480367.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 227, folder 35"])(Undated, circa 1967-circa 2009)[Genscher, Hans Dietrich with Kissinger]. https://collections.library.yale.edu/catalog/12480367.