Gindaba และ Refissa Bekele. (1997) Factors affecting work performance and job satisfaction of health assistants in the province of Wollega, Ethiopia. Mahidol University,:ม.ป.ท.Gindaba และ Refissa Bekele. 1997. Factors affecting work performance and job satisfaction of health assistants in the province of Wollega, Ethiopia. ม.ป.ท.:Mahidol University,;Gindaba และ Refissa Bekele. Factors affecting work performance and job satisfaction of health assistants in the province of Wollega, Ethiopia. ม.ป.ท.:Mahidol University, 1997. Print.