Welish, M., & Duff, J. (1993). John Duff. Journal of Contemporary Art.
Lua i Stíl Chicago (17ú heag.)Welish, Marjorie, agus John Duff. "John Duff." Journal of Contemporary Art 1993.
Lua MLA (8ú heag.)Welish, Marjorie, agus John Duff. "John Duff." Journal of Contemporary Art, 1993.
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