Khai และ Ton That. (1991) Factors related to the disturbance in life and work of shiftworkers in a motorcycle factory. Mahidol University,:ม.ป.ท.Khai และ Ton That. 1991. Factors related to the disturbance in life and work of shiftworkers in a motorcycle factory. ม.ป.ท.:Mahidol University,;Khai และ Ton That. Factors related to the disturbance in life and work of shiftworkers in a motorcycle factory. ม.ป.ท.:Mahidol University, 1991. Print.