MLA

Weigl, Karl, 1881-1949. Moldenhauer, Hans. Box 30, folder 978. 1967-1982. https://collections.library.yale.edu/catalog/32212332.

APA, 6th edition

Weigl, Karl, 1881-1949. (["Box 30, folder 978"])(1967-1982)[Moldenhauer, Hans]. https://collections.library.yale.edu/catalog/32212332.