MLA

Pratt, Richard Henry, 1840-1924. Anna L. Pratt: reminiscences. Box 22, folder 718. n.d.. https://collections.library.yale.edu/catalog/17104194.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 22, folder 718"])(n.d.)[Anna L. Pratt: reminiscences]. https://collections.library.yale.edu/catalog/17104194.