MLA

Lloyd, Lewis L. (1938). Clipping file on Lenny Bruce; miscellaneous periodicals; correspondence relating to Niels Kehlet, ABC European tour, and the American Ballet Theater. Box 17. 1969. https://collections.library.yale.edu/catalog/15825683.

APA, 6th edition

Lloyd, Lewis L. (1938). (["Box 17"])(1969)[Clipping file on Lenny Bruce; miscellaneous periodicals; correspondence relating to Niels Kehlet, ABC European tour, and the American Ballet Theater]. https://collections.library.yale.edu/catalog/15825683.