MLA

Schwartz, Delmore, 1913-1966. Legal documents, statements, and letters. Box 21, folder 826-836. 1958-1961. https://collections.library.yale.edu/catalog/2064471.

APA, 6th edition

Schwartz, Delmore, 1913-1966. (["Box 21, folder 826-836"])(1958-1961)[Legal documents, statements, and letters]. https://collections.library.yale.edu/catalog/2064471.