MLA

Ficke, Arthur Davison, 1883-1945. Aldis, Mary. "Ghostly Caperings," watercolor, inscribed and signed (in Series VII). Box 63, folder 1765. n.d.. https://collections.library.yale.edu/catalog/2003221.

APA, 6th edition

Ficke, Arthur Davison, 1883-1945. (["Box 63, folder 1765"])(n.d.)[Aldis, Mary. "Ghostly Caperings," watercolor, inscribed and signed (in Series VII)]. https://collections.library.yale.edu/catalog/2003221.