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1Gepubliceerd in 2018Available for University of the Philippines Baguio via IG Library. Click here to access
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2Gepubliceerd in 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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3Gepubliceerd in 2011Available for the University of the Philippines Diliman via SpringerLink. Click here to access
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4door Almond, Gabriel A. 1911-2002Available for University of the Philippines System via de Gruyter Online. Click here to access
Gepubliceerd in 1989
Electronic Resource