Piedad JR. และ Publio V. (1992) Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province. Mahidol University,:ม.ป.ท.Piedad JR. และ Publio V. 1992. Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province. ม.ป.ท.:Mahidol University,;Piedad JR. และ Publio V. Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province. ม.ป.ท.:Mahidol University, 1992. Print.