Shigeru Yamato และ Kitti Limskul. (2011) Effect of Happy Workplace Program : a case study of 2 firms in Thailand. Chulalongkorn University:ม.ป.ท.Shigeru Yamato และ Kitti Limskul. 2011. Effect of Happy Workplace Program : a case study of 2 firms in Thailand. ม.ป.ท.:Chulalongkorn University;Shigeru Yamato และ Kitti Limskul. Effect of Happy Workplace Program : a case study of 2 firms in Thailand. ม.ป.ท.:Chulalongkorn University, 2011. Print.