Krisana Wattanathamrong และ Srisombat Chokprajakchat. (2011) The law enforcement of police officers on illegal alien labours. Mahidol University:ม.ป.ท.Krisana Wattanathamrong และ Srisombat Chokprajakchat. 2011. The law enforcement of police officers on illegal alien labours. ม.ป.ท.:Mahidol University;Krisana Wattanathamrong และ Srisombat Chokprajakchat. The law enforcement of police officers on illegal alien labours. ม.ป.ท.:Mahidol University, 2011. Print.