Pepper, I. (1997). From the Aesthetics of Indifference to Negative Aesthetics: John Cage and Germany 1958-1972. October.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPepper, Ian. "From the Aesthetics of Indifference to Negative Aesthetics: John Cage and Germany 1958-1972." October 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPepper, Ian. "From the Aesthetics of Indifference to Negative Aesthetics: John Cage and Germany 1958-1972." October, 1997.
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