MLA

Faulkner, William, 1897-1962. "That Evening Sun," handwritten draft and photostats, typescript transcript and photocopies. Box 1. undated. https://collections.library.yale.edu/catalog/17218176.

APA, 6th edition

Faulkner, William, 1897-1962. (["Box 1"])(undated)["That Evening Sun," handwritten draft and photostats, typescript transcript and photocopies]. https://collections.library.yale.edu/catalog/17218176.