MLA

Kissinger, Henry, 1923-2023. Vietnam, 1970. Box 208, folder 4. 1970-1971, undated. https://collections.library.yale.edu/catalog/12480786.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 208, folder 4"])(1970-1971, undated)[Vietnam, 1970]. https://collections.library.yale.edu/catalog/12480786.