Amornrat Praphant และ Prapapen Suwan. (2003) Preventive behaviors from dust among workers in lime factories and stone crushing mills, Nakhon Si Thammarat Province. Chulalongkorn University:ม.ป.ท.Amornrat Praphant และ Prapapen Suwan. 2003. Preventive behaviors from dust among workers in lime factories and stone crushing mills, Nakhon Si Thammarat Province. ม.ป.ท.:Chulalongkorn University;Amornrat Praphant และ Prapapen Suwan. Preventive behaviors from dust among workers in lime factories and stone crushing mills, Nakhon Si Thammarat Province. ม.ป.ท.:Chulalongkorn University, 2003. Print.