MLA

Pratt, Richard Henry, 1840-1924. Sioux Commission: 1888 Jun-1889 May. Box 10-60. 1867-1924. https://collections.library.yale.edu/catalog/32452888.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 10-60"])(1867-1924)[Sioux Commission: 1888 Jun-1889 May]. https://collections.library.yale.edu/catalog/32452888.