Otterspeer. In Praise of Ambiguity. Leiden University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOtterspeer. In Praise of Ambiguity. Leiden University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOtterspeer. In Praise of Ambiguity. Leiden University Press.
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