MLA

Ficke, Arthur Davison, 1883-1945. "Study in Religious Emotion," watercolor and ink, with poem, holograph (in Series VII). Box 63, folder 1800. n.d.. https://collections.library.yale.edu/catalog/15813055.

APA, 6th edition

Ficke, Arthur Davison, 1883-1945. (["Box 63, folder 1800"])(n.d.)["Study in Religious Emotion," watercolor and ink, with poem, holograph (in Series VII)]. https://collections.library.yale.edu/catalog/15813055.