MLA

Kissinger, Henry, 1923-2023. Ford, Gerald R. with Kissinger at Conference on Security and Co-operation in Europe (CSCE), Helsinki. Box 222, folder 38. 1975 July 31-August 1. https://collections.library.yale.edu/catalog/12480841.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 222, folder 38"])(1975 July 31-August 1)[Ford, Gerald R. with Kissinger at Conference on Security and Co-operation in Europe (CSCE), Helsinki]. https://collections.library.yale.edu/catalog/12480841.