Lt. JG.Piyamaporn Singkhum และ Sucheera Phattharayuttawat. (2010) Hardiness and naval professional training performance in royal thai naval academy students. Mahidol University:ม.ป.ท.Lt. JG.Piyamaporn Singkhum และ Sucheera Phattharayuttawat. 2010. Hardiness and naval professional training performance in royal thai naval academy students. ม.ป.ท.:Mahidol University;Lt. JG.Piyamaporn Singkhum และ Sucheera Phattharayuttawat. Hardiness and naval professional training performance in royal thai naval academy students. ม.ป.ท.:Mahidol University, 2010. Print.