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1
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2Bằng Lui, Kung-JongAvailable for University of the Philippines Baguio via Wiley Online Library. Click here to access
Được phát hành 2011
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3
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4Được phát hành 2009Available for University of the Philippines Baguio via Wiley Online Library. Click here to access
Electronic Resource -
5Bằng Dattalo, PatrickAvailable for University of the Philippines Baguio via Oxford Academic. Click here to access
Được phát hành 2008
Electronic Resource -
6
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7Được phát hành 2006Available for University of the Philippines Baguio via Gale Virtual Reference Library. Click here to access
Electronic Resource -
8Bằng McKillup, SteveAvailable for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Được phát hành 2005
Electronic Resource