MLA

Kissinger, Henry, 1923-2023. Statistical Workbook on Selected Domestic Problems of the United States [1 of 2]. Box 233, folder 6. 1967 December 8. https://collections.library.yale.edu/catalog/11786275.

APA, 6th edition

Kissinger, Henry, 1923-2023. (["Box 233, folder 6"])(1967 December 8)[Statistical Workbook on Selected Domestic Problems of the United States [1 of 2]]. https://collections.library.yale.edu/catalog/11786275.