MLA

Grinnell, Julius S. (Julius Sprague), 1842-1898. Metal strongbox, "Julius S. Grinnell. Private" inscribed on lid (in Series III). Art, folder 120. n.d.. https://collections.library.yale.edu/catalog/2019159.

APA, 6th edition

Grinnell, Julius S. (Julius Sprague), 1842-1898. (["Art, folder 120"])(n.d.)[Metal strongbox, "Julius S. Grinnell. Private" inscribed on lid (in Series III)]. https://collections.library.yale.edu/catalog/2019159.