MLA

Sartre, Jean-Paul, 1905-1980. Interview 8. Box 1, folder 7. 1971 Mar 12. https://collections.library.yale.edu/catalog/16538161.

APA, 6th edition

Sartre, Jean-Paul, 1905-1980. (["Box 1, folder 7"])(1971 Mar 12)[Interview 8]. https://collections.library.yale.edu/catalog/16538161.