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7מאת Yukl, Gary A. 1940-Available for University of the Philippines Baguio via OER. Click here to access
יצא לאור 2013
Electronic Resource -
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9מאת Lawson, KarenAvailable for University of the Philippines Baguio via IG Library. Click here to access
יצא לאור 2009
Electronic Resource -
10מאת Stewart, BobAvailable for University of the Philippines Baguio via IG Library. Click here to access
יצא לאור 2009
Electronic Resource