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1by Kracht, MarcusAvailable for University of the Philippines Diliman via SpringerLink. Click here to access
Published 2011
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2by Soames, ScottAvailable for the University of the Philippines System via IG Library. Click here to access
Published 2010
Electronic Resource -
3by Soames, ScottAvailable for the University of the Philippines Baguio via IG Library. Click here to access
Published 2010
Electronic Resource -
4by Gonzales, Francis R.Full text access requires UP Webmail login
Published 2009
Electronic Resource