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1Bằng Stocum, David L.Available for University of the Philippines Diliman via Sciencedirect. Click here to access
Được phát hành 2013
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2Bằng Vogel, Harold L.Available for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Được phát hành 2010
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4Được phát hành 2007Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
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5Được phát hành 2006Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource