MLA

Kissinger, Henry, 1923-2023. Helsinki. Box 245. 1975 July-August. https://collections.library.yale.edu/catalog/12481495.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 245"])(1975 July-August)[Helsinki]. https://collections.library.yale.edu/catalog/12481495.