MLA

Kissinger, Henry, 1923-2023. Nouvelle Theorie Sociale. Box 45, folder 19. 1961-1962, undated. https://collections.library.yale.edu/catalog/11783228.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 45, folder 19"])(1961-1962, undated)[Nouvelle Theorie Sociale]. https://collections.library.yale.edu/catalog/11783228.