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1Được phát hành 2007Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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2Được phát hành 2005Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
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3Được phát hành 2005Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
Electronic Resource -
4Bằng Ferber, MichaelAvailable for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
Được phát hành 1999
Electronic Resource -
5Bằng Sage, LornaAvailable for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
Được phát hành 1999
Electronic Resource