MLA

Kissinger, Henry, 1923-2023. Friedrich, Carl J.. Box 257, folder 7. 1964-1966. https://collections.library.yale.edu/catalog/11786701.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 257, folder 7"])(1964-1966)[Friedrich, Carl J.]. https://collections.library.yale.edu/catalog/11786701.