MLA

Champneys, Basil, 1842-1935. Patmore, Coventry Kersey Dighton: "Let be" and "Farewell," holograph, corrected and signed. Box 1, folder 96. n.d.. https://collections.library.yale.edu/catalog/16495047.

APA, 6th edition

Champneys, Basil, 1842-1935. (["Box 1, folder 96"])(n.d.)[Patmore, Coventry Kersey Dighton: "Let be" and "Farewell," holograph, corrected and signed]. https://collections.library.yale.edu/catalog/16495047.