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2Được phát hành 2017Available for University of the Philippines Baguio - Graduate Resource Center via Springer Link. Click here to access
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3Được phát hành 2016Available for University of the Philippines Baguio - Graduate Resource Center via Springer Link. Click here to access
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4Bằng Yukl, Gary A. 1940-Available for University of the Philippines Baguio via OER. Click here to access
Được phát hành 2013
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5Được phát hành 2008Available for University of the Philippines Baguio via Gale Virtual Reference Library. Click here to access
Electronic Resource