MLA

Lowenfels, Walter, 1897-1976. Stone, Ed. Box 32, folder 651-653. 1965-1976, undated. https://collections.library.yale.edu/catalog/17174424.

APA, 6th edition

Lowenfels, Walter, 1897-1976. (["Box 32, folder 651-653"])(1965-1976, undated)[Stone, Ed]. https://collections.library.yale.edu/catalog/17174424.