MLA

Guest, Barbara, 1920-2006. Manley, Charles. Box 140, folder 1988-1989. 1973. https://collections.library.yale.edu/catalog/2029135.

APA, 6th edition

Guest, Barbara, 1920-2006. (["Box 140, folder 1988-1989"])(1973)[Manley, Charles]. https://collections.library.yale.edu/catalog/2029135.