Berio, L. (1961). Circles: For female voice, harp, 2 percussion players. Universal Edition.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerio, Luciano. Circles: For Female Voice, Harp, 2 Percussion Players. London: Universal Edition, 1961.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBerio, Luciano. Circles: For Female Voice, Harp, 2 Percussion Players. Universal Edition, 1961.
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