Morgan, D. Spirit and medium: The video art of Bill Viola / David Morgan. The art of Bill Viola.(2004).
Lua i Stíl Chicago (17ú heag.)Morgan, David. "Spirit and Medium: The Video Art of Bill Viola / David Morgan." The Art of Bill Viola.(2004) .
Lua MLA (8ú heag.)Morgan, David. "Spirit and Medium: The Video Art of Bill Viola / David Morgan." The Art of Bill Viola.(2004), .
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