MLA

McKay, Claude, 1890-1948. Bontemps, Arna Wendell. Box 1, folder 13. 1941-52. https://collections.library.yale.edu/catalog/32180799.

APA, 6th edition

McKay, Claude, 1890-1948. (["Box 1, folder 13"])(1941-52)[Bontemps, Arna Wendell]. https://collections.library.yale.edu/catalog/32180799.