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1Cyhoeddwyd 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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2Cyhoeddwyd 2009Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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3Cyhoeddwyd 2009Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
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4Cyhoeddwyd 2007Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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5Cyhoeddwyd 2007Available for University of the Philippines Baguio via Gale Virtual Reference Library. Click here to access
Electronic Resource