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1Julkaistu 2017Available for University of the Philippines Baguio. Click here to access
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2Julkaistu 2013Available for University of the Philippines System via Sage Knowledge. Click here to access
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3Julkaistu 2013Available for University of the Philippines Baguio via Sage Knowledge. Click here to access
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4Tekijä Dougherty, Keith L.Available for the University of the Philippines Diliman via Springerlink. Click here to access
Julkaistu 2011
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8Julkaistu 2004Available for the University of the Philippines System via SAGE Knowledge. Click here to access
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