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12Published 2010Available for University of the Philippines Baguio via Oxford Scholarship Online. Click here to access
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16Published 2001Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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17Published 2001Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
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18by Barnes, R. S. K.Available for University of the Philippines Diliman via Wiley Online Library. Click here to access
Published 1999
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