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2Được phát hành 2020Available for University of the Philippines System via Taylor & Francis Online. Click here to access
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4Được phát hành 2020Available for University of the Philippines Baguio via Oxford Academic. Click here to access
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5Bằng Marks, JonathanAvailable for University of the Philippines System via Vital Source Online.
Được phát hành 2017
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7Bằng Campbell, ElizabethAvailable for University of the Philippines System via Vital Source Online.
Được phát hành 2015
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8Bằng Penprase, Bryan E.Available for University of the Philippines Diliman via SpringerLink. Click here to access
Được phát hành 2011
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9Được phát hành 2011Available for University of the Philippines Diliman via SpringerLink. Click here to access
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12Bằng Beck, Margaret E.Full text access requires UP Webmail login
Được phát hành 2003
Electronic Resource