MLA

Pratt, Richard Henry, 1840-1924. Display on Etahdleuh Doanmoe. Box 33, folder 835. n.d.. https://collections.library.yale.edu/catalog/16895281.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 33, folder 835"])(n.d.)[Display on Etahdleuh Doanmoe]. https://collections.library.yale.edu/catalog/16895281.