Herzogenrath, W., Kreul, A., & Hopfengart, C. (2002). Klänge des inneren Auges: Mark Tobey, Morris Graves, John Cage. Schirmer/Mosel.
Chicago Style (17. basım) AtıfHerzogenrath, Wulf, Andreas Kreul, ve Christine Hopfengart. Klänge Des Inneren Auges: Mark Tobey, Morris Graves, John Cage. München [u.a.]: Schirmer/Mosel, 2002.
MLA (8th ed.) AtıfHerzogenrath, Wulf, et al. Klänge Des Inneren Auges: Mark Tobey, Morris Graves, John Cage. Schirmer/Mosel, 2002.
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