MLA

Van Thal, Herbert, 1904-1983. Langley, Noel. Box 1, folder 74. 1959-60, n.d.. https://collections.library.yale.edu/catalog/16545978.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 74"])(1959-60, n.d.)[Langley, Noel]. https://collections.library.yale.edu/catalog/16545978.