Ridley, A. (1997). Not Ideal: Collingwood's Expression Theory. The Journal of Aesthetics and Art Criticism.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRidley, Aaron. "Not Ideal: Collingwood's Expression Theory." The Journal of Aesthetics and Art Criticism 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRidley, Aaron. "Not Ideal: Collingwood's Expression Theory." The Journal of Aesthetics and Art Criticism, 1997.
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