MLA

Ficke, Arthur Davison, 1883-1945. "The Soul Looks Within Seeking to Discover its True Color," watercolor and ink (in Series VII). Box 63, folder 1795. n.d.. https://collections.library.yale.edu/catalog/15813052.

APA, 6th edition

Ficke, Arthur Davison, 1883-1945. (["Box 63, folder 1795"])(n.d.)["The Soul Looks Within Seeking to Discover its True Color," watercolor and ink (in Series VII)]. https://collections.library.yale.edu/catalog/15813052.