MLA

Weill, Kurt, 1900-1950. ASCAP. Box 48, folder 18. 1938-1945. https://collections.library.yale.edu/catalog/32501463.

APA, 6th edition

Weill, Kurt, 1900-1950. (["Box 48, folder 18"])(1938-1945)[ASCAP]. https://collections.library.yale.edu/catalog/32501463.