MLA

Kissinger, Henry, 1923-2023. Thirteenth Pugwash Conference, Karlovy Vary, Czechoslovakia, Sep 13-19, 1964. Box 108, folder 10. 1964 March-September. https://collections.library.yale.edu/catalog/11784245.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 108, folder 10"])(1964 March-September)[Thirteenth Pugwash Conference, Karlovy Vary, Czechoslovakia, Sep 13-19, 1964]. https://collections.library.yale.edu/catalog/11784245.