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1Cyhoeddwyd 2018Available for University of the Philippines Baguio via Cambridge Core eBooks. Click here to access
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2Llyfr
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3Cyhoeddwyd 2012Available for University of the Philippines Diliman via Cambridge. Click here to access
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4Cyhoeddwyd 2010Available for University of the Philippines Diliman via Cambridge. Click here to access
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5Cyhoeddwyd 2010Available for University of the Philippines Diliman via Cambridge. Click here to access
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6Cyhoeddwyd 2010Available for University of the Philippines Baguio via Cambridge Books Online. Click here to access
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9gan Sternberg, Robert J.
Cyhoeddwyd 2002Llyfr