MLA

Kissinger, Henry, 1923-2023. Zavidovo. Box 228, folder 22. 1973 May. https://collections.library.yale.edu/catalog/12480847.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 228, folder 22"])(1973 May)[Zavidovo]. https://collections.library.yale.edu/catalog/12480847.