MLA

Kissinger, Henry, 1923-2023. Seitz, Raymond with Kissinger. Box 228, folder 11. Undated, circa 1967-circa 2009. https://collections.library.yale.edu/catalog/12480513.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 228, folder 11"])(Undated, circa 1967-circa 2009)[Seitz, Raymond with Kissinger]. https://collections.library.yale.edu/catalog/12480513.