MLA

Kissinger, Henry, 1923-2023. Schelling, Thomas C.. Box 124, folder 2. 1965 May-1968 December. https://collections.library.yale.edu/catalog/11784505.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 124, folder 2"])(1965 May-1968 December)[Schelling, Thomas C.]. https://collections.library.yale.edu/catalog/11784505.