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Yoo, Sang-hun Colege of home economics University of the Philip, 1997,
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2
University of the Philippines Diliman University of the Philippines Dilimann,, 1990,
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3
University of the Philippines University of the Philippines ,, 1975,
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4
Serafin D.Quiason Quezon city University of the Philippines press, 1966,
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5
David, F.G. University of the philippines ,, 1900,
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