Sapsatree Santaweesuk และ Wattasit Siriwong. (2013) EFFECTIVENESS OF INJURY AND ILLNESS PREVENTION PROGRAM AMONG RICE FARMERS AT ONGKHARAK DISTRICT NAKHON NAYOK PROVINCE THAILAND. Chulalongkorn University:ม.ป.ท.Sapsatree Santaweesuk และ Wattasit Siriwong. 2013. EFFECTIVENESS OF INJURY AND ILLNESS PREVENTION PROGRAM AMONG RICE FARMERS AT ONGKHARAK DISTRICT NAKHON NAYOK PROVINCE THAILAND. ม.ป.ท.:Chulalongkorn University;Sapsatree Santaweesuk และ Wattasit Siriwong. EFFECTIVENESS OF INJURY AND ILLNESS PREVENTION PROGRAM AMONG RICE FARMERS AT ONGKHARAK DISTRICT NAKHON NAYOK PROVINCE THAILAND. ม.ป.ท.:Chulalongkorn University, 2013. Print.