MLA

Pound, Ezra, 1885-1972. The Seal Script: photograph. Box 90, folder 3846-3854. n.d.. https://collections.library.yale.edu/catalog/17122716.

APA, 6th edition

Pound, Ezra, 1885-1972. (["Box 90, folder 3846-3854"])(n.d.)[The Seal Script: photograph]. https://collections.library.yale.edu/catalog/17122716.