Bowler. Wildlife of Madeira and the Canary Islands. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBowler. Wildlife of Madeira and the Canary Islands. Princeton University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBowler. Wildlife of Madeira and the Canary Islands. Princeton University Press.
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