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3Published 2017Available for University of the Philippines Baguio via Cambridge Core eBooks. Click here to access
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4Published 2016Available for University of the Philippines Baguio via De Gryuter. Click here to access
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6Published 2012Available for the University of the Philippines System via Oxford scholarship online. Click here to access
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9Published 2011Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
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