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1Baskı/Yayın Bilgisi 2012Available for University of the Philippines Baguio via Gale Virtual Reference Library. Click here to access
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2Yazar: Nye, EdwardAvailable for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Baskı/Yayın Bilgisi 2011
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3Yazar: MacKay, EllenAvailable for the University of the Philippines System via IG Library. Click here to access
Baskı/Yayın Bilgisi 2011
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4Yazar: Worthen, William B. 1955-Available for University of the Philippines Baguio via Wiley Online Library. Click here to access
Baskı/Yayın Bilgisi 2010
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5Yazar: Miller, J. ScottAvailable for University of the Philippines Baguio via IG Library. Click here to access
Baskı/Yayın Bilgisi 2009
Electronic Resource