MLA

Carson, Rachel, 1907-1964. Food contamination. Box 34, folder 602. 1955-61, n.d.. https://collections.library.yale.edu/catalog/17145167.

APA, 6th edition

Carson, Rachel, 1907-1964. (["Box 34, folder 602"])(1955-61, n.d.)[Food contamination]. https://collections.library.yale.edu/catalog/17145167.