MLA

Hurston, Zora Neale, 1891-1960. "Now You Cookin' With Gas", short story, two versions (one incomplete): typescript carbon. Box 2, folder 21. n.d.. https://collections.library.yale.edu/catalog/16732234.

APA, 6th edition

Hurston, Zora Neale, 1891-1960. (["Box 2, folder 21"])(n.d.)["Now You Cookin' With Gas", short story, two versions (one incomplete): typescript carbon]. https://collections.library.yale.edu/catalog/16732234.