MLA

Williams, Jonathan, 1929-2008. P0450-P0999. Box 47. circa 1951-circa 1997. https://collections.library.yale.edu/catalog/33330297.

APA, 6th edition

Williams, Jonathan, 1929-2008. (["Box 47"])(circa 1951-circa 1997)[P0450-P0999]. https://collections.library.yale.edu/catalog/33330297.