Chayachai Aim-iam. (2005) A study of a practical work-rest regimen in cold storage workers at-15 Celsius. Mahidol University,:ม.ป.ท.Chayachai Aim-iam. 2005. A study of a practical work-rest regimen in cold storage workers at-15 Celsius. ม.ป.ท.:Mahidol University,;Chayachai Aim-iam. A study of a practical work-rest regimen in cold storage workers at-15 Celsius. ม.ป.ท.:Mahidol University, 2005. Print.