MLA

Carson, Rachel, 1907-1964. Houghton Mifflin Company. Box 89, folder 1572-73. n.d.. https://collections.library.yale.edu/catalog/16073953.

APA, 6th edition

Carson, Rachel, 1907-1964. (["Box 89, folder 1572-73"])(n.d.)[Houghton Mifflin Company]. https://collections.library.yale.edu/catalog/16073953.