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Sorrapong Udomsilp. (1999) PTA project appraisal from selected technology . Chulalongkorn University/Bangkok.
Sorrapong Udomsilp. PTA project appraisal from selected technology. . Bangkok:Chulalongkorn University, 1999.
Sorrapong Udomsilp. (1999) PTA project appraisal from selected technology . Chulalongkorn University/Bangkok.