Hill, Gary. — Sums & differences. — New York : Electronic Arts Intermix, 1978. — DVD Video, b&w, sound, 8 min 24 s.
Video / Work of Art - CR+D call code: VID 00021646 - Document in English - State in the CR+D Collection : COPY - This document is included in Selected works II, 2004. — DVD Video.
The CR+D Database contains the following indexation: (Please note that indexation is not always exhaustive.)