MLA

Kissinger, Henry, 1923-2023. Stee-Stel. Box 431, folder 4. 1979. https://collections.library.yale.edu/catalog/11777729.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 431, folder 4"])(1979)[Stee-Stel]. https://collections.library.yale.edu/catalog/11777729.