MLA

Toomer, Jean, 1894-1967. Author's corrections. Box 26, folder 608. 1923 May 1. https://collections.library.yale.edu/catalog/16725515.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 26, folder 608"])(1923 May 1)[Author's corrections]. https://collections.library.yale.edu/catalog/16725515.