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6ανά Yukl, Gary A. 1940-Available for University of the Philippines Baguio via OER. Click here to access
Έκδοση 2013
Electronic Resource -
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8ανά Lawson, KarenAvailable for University of the Philippines Baguio via IG Library. Click here to access
Έκδοση 2009
Electronic Resource -
9ανά Stewart, BobAvailable for University of the Philippines Baguio via IG Library. Click here to access
Έκδοση 2009
Electronic Resource -
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