Wells, J. V. (2007). Birder's conservation handbook: 100 North American birds at risk. Princeton University Press.
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Chicago-čujuhus (17. p.)
Wells, Jeffrey V. Birder's Conservation Handbook: 100 North American Birds at Risk. Princeton, N.J. ; Woodstock: Princeton University Press, 2007.
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MLA-čujuhus (9. p.)
Wells, Jeffrey V. Birder's Conservation Handbook: 100 North American Birds at Risk. Princeton University Press, 2007.
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