MLA

Van Thal, Herbert, 1904-1983. Harling, Robert. Box 1, folder 57. 1954-59. https://collections.library.yale.edu/catalog/16545961.

APA, 6th edition

Van Thal, Herbert, 1904-1983. (["Box 1, folder 57"])(1954-59)[Harling, Robert]. https://collections.library.yale.edu/catalog/16545961.