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Biao และผู้แต่งคนอื่นๆ. 1991. Factors affecting the village headmen's knowledge and attitude in promoting water supply in Kamphaeng Phet province of ThailandYang Biao. Faculty of Graduate Studies, Mahidol University;
Biao และผู้แต่งคนอื่นๆ. (1991) Factors affecting the village headmen's knowledge and attitude in promoting water supply in Kamphaeng Phet province of ThailandYang Biao . Mahidol University/Bangkok.
Biao และผู้แต่งคนอื่นๆ. Factors affecting the village headmen's knowledge and attitude in promoting water supply in Kamphaeng Phet province of ThailandYang Biao. . Bangkok:Mahidol University, 1991.
Biao และผู้แต่งคนอื่นๆ. (1991) Factors affecting the village headmen's knowledge and attitude in promoting water supply in Kamphaeng Phet province of ThailandYang Biao . Mahidol University/Bangkok.