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4Published 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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7Published 2006Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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11by Slee, Phillip T.Available for University of the Philippines Diliman via Cambridge. Click here to access
Published 2002
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12by Thomas, R. Murray 1921-Available for UP Diliman via SAGE Knowledge
Published 1999
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16Published 1989Available for UP System via Cambridge Core eJournals Full Collection
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