MLA

Kissinger, Henry, 1923-2023. Scha-Schn. Box 418, folder 19. 1978. https://collections.library.yale.edu/catalog/11777563.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 418, folder 19"])(1978)[Scha-Schn]. https://collections.library.yale.edu/catalog/11777563.