MLA

Kissinger, Henry, 1923-2023. Vietnam trip, 1966, general. Box 101, folder 7. 1966 Jun, undated. https://collections.library.yale.edu/catalog/11784152.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 101, folder 7"])(1966 Jun, undated)[Vietnam trip, 1966, general]. https://collections.library.yale.edu/catalog/11784152.