Ecology
MLA
Carson, Rachel, 1907-1964. Ecology. Box 18, folder 339. n.d.. https://collections.library.yale.edu/catalog/17145159.
APA, 6th edition
Carson, Rachel, 1907-1964. (["Box 18, folder 339"])(n.d.)[Ecology]. https://collections.library.yale.edu/catalog/17145159.