MLA

Kissinger, Henry, 1923-2023. De Rothschild, Lynn with Kissinger. Box 227, folder 14. 2006 February 20. https://collections.library.yale.edu/catalog/12480362.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 227, folder 14"])(2006 February 20)[De Rothschild, Lynn with Kissinger]. https://collections.library.yale.edu/catalog/12480362.