Shamena และ Eyoel Jarsa. (1997) Factors related to perceived job performance of malaria field workers and supervisors in Southern Ethiopia. Mahidol University,:ม.ป.ท.Shamena และ Eyoel Jarsa. 1997. Factors related to perceived job performance of malaria field workers and supervisors in Southern Ethiopia. ม.ป.ท.:Mahidol University,;Shamena และ Eyoel Jarsa. Factors related to perceived job performance of malaria field workers and supervisors in Southern Ethiopia. ม.ป.ท.:Mahidol University, 1997. Print.