Karn Thamkasem. (1999) Problems in detective tasks of the polices officers of the Crime Suppression Division. Mahidol University,:ม.ป.ท.Karn Thamkasem. 1999. Problems in detective tasks of the polices officers of the Crime Suppression Division. ม.ป.ท.:Mahidol University,;Karn Thamkasem. Problems in detective tasks of the polices officers of the Crime Suppression Division. ม.ป.ท.:Mahidol University, 1999. Print.