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5Por Fraser, John R. S. 1946-Available for University of the Philippines Baguio via OER. Click here to access
Publicado em 2015
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6Por Stocum, David L.Available for University of the Philippines Diliman via Sciencedirect. Click here to access
Publicado em 2013
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8Publicado em 2007Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource -
9Publicado em 2006Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource