Tyrol. Through a Naturalist's Eyes. University Press of New England.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTyrol. Through a Naturalist's Eyes. University Press of New England.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTyrol. Through a Naturalist's Eyes. University Press of New England.
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