MLA

Pratt, Richard Henry, 1840-1924. Miscellaneous illustrations. Box 30, folder 833. n.d.. https://collections.library.yale.edu/catalog/2042699.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 30, folder 833"])(n.d.)[Miscellaneous illustrations]. https://collections.library.yale.edu/catalog/2042699.