Lua APA (7ú heag.)

Bergh, J. v. d. (1991). Roman Opalka: Opaque Addition. Flash Art.

Lua i Stíl Chicago (17ú heag.)

Bergh, Jos van den. "Roman Opalka: Opaque Addition." Flash Art 1991.

Lua MLA (8ú heag.)

Bergh, Jos van den. "Roman Opalka: Opaque Addition." Flash Art, 1991.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.