Ulvaeus. The Book of Music and Nature. Wesleyan University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUlvaeus. The Book of Music and Nature. Wesleyan University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUlvaeus. The Book of Music and Nature. Wesleyan University Press.
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