MLA

Carson, Rachel, 1907-1964. Deaths among children. Box 32, folder 568. 1963, n.d.. https://collections.library.yale.edu/catalog/17145163.

APA, 6th edition

Carson, Rachel, 1907-1964. (["Box 32, folder 568"])(1963, n.d.)[Deaths among children]. https://collections.library.yale.edu/catalog/17145163.