Piedad JR. และผู้แต่งคนอื่นๆ. 1992. Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province. Faculty of Graduate Studies, Mahidol University;
Piedad JR. และผู้แต่งคนอื่นๆ. (1992) Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province . Mahidol University/Bangkok.
Piedad JR. และผู้แต่งคนอื่นๆ. Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province. . Bangkok:Mahidol University, 1992.
Piedad JR. และผู้แต่งคนอื่นๆ. (1992) Factors affecting performance of health volunteers in the promotion of nutrition programmes : a study in Suphanburi province . Mahidol University/Bangkok.