MLA

Geldzahler, Henry, 1935-1994. Portraits of Geldzahler. Box 26. circa 1945-1996. https://collections.library.yale.edu/catalog/2012804.

APA, 6th edition

Geldzahler, Henry, 1935-1994. (["Box 26"])(circa 1945-1996)[Portraits of Geldzahler]. https://collections.library.yale.edu/catalog/2012804.