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1
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2per Schoenbach, LisiAvailable for University of the Philippines Baguio via Oxford Scholarship Online. Click here to access
Publicat 2012
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3per Desmond, Kathleen KadonAvailable for University of the Philippines System via Wiley Online Library. Click here to access
Publicat 2011
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5
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6
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7
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8Publicat 2008Available for University of the Philippines Baguio via Wiley Online Library. Click here to access
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10per Wicke, PeterAvailable for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Publicat 1990
Electronic Resource