Piyavadee Accaranit และ Winai Nutmagul. (2011) Relationship of dust concentration and related factors on pulmonary function of concrete pile factory workers. Mahidol University:ม.ป.ท.Piyavadee Accaranit และ Winai Nutmagul. 2011. Relationship of dust concentration and related factors on pulmonary function of concrete pile factory workers. ม.ป.ท.:Mahidol University;Piyavadee Accaranit และ Winai Nutmagul. Relationship of dust concentration and related factors on pulmonary function of concrete pile factory workers. ม.ป.ท.:Mahidol University, 2011. Print.