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5Yazar: Fraser, John R. S. 1946-Available for University of the Philippines Baguio via OER. Click here to access
Baskı/Yayın Bilgisi 2015
Electronic Resource -
6Yazar: Stocum, David L.Available for University of the Philippines Diliman via Sciencedirect. Click here to access
Baskı/Yayın Bilgisi 2013
Electronic Resource -
7Yazar: Vogel, Harold L.Available for University of the Philippines Baguio via Cambridge Books Online. Click here to access
Baskı/Yayın Bilgisi 2010
Electronic Resource -
8Baskı/Yayın Bilgisi 2007Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource -
9Baskı/Yayın Bilgisi 2006Available for University of the Philippines System via Gale Virtual Reference Library. Click here to access
Electronic Resource