MLA

Kissinger, Henry, 1923-2023. Giesen Management. Box 25, folder 3. 1961-1965. https://collections.library.yale.edu/catalog/11782762.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 25, folder 3"])(1961-1965)[Giesen Management]. https://collections.library.yale.edu/catalog/11782762.