MLA

Geldzahler, Henry, 1935-1994. Uncataloged files. Box 29. circa 1945-1996. https://collections.library.yale.edu/catalog/17185214.

APA, 6th edition

Geldzahler, Henry, 1935-1994. (["Box 29"])(circa 1945-1996)[Uncataloged files]. https://collections.library.yale.edu/catalog/17185214.