MLA

Hersey, John, 1914-1993. My Petition for More Space, computer printout, photocopy of proof, notes, reviews and correspondence. Box 54. 1973. https://collections.library.yale.edu/catalog/15208693.

APA, 6th edition

Hersey, John, 1914-1993. (["Box 54"])(1973)[My Petition for More Space, computer printout, photocopy of proof, notes, reviews and correspondence]. https://collections.library.yale.edu/catalog/15208693.