El Safy, H. E. T. H., & Oneill, W. F. (1985). Job satisfaction and job performance among the middle management personnel of the Sudanese public service. University of Southern California,Faculty of the graduate School.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)El Safy, Hamid El Tag H., و William F. Oneill. Job Satisfaction and Job Performance Among the Middle Management Personnel of the Sudanese Public Service. California: University of Southern California,Faculty of the graduate School, 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)El Safy, Hamid El Tag H., و William F. Oneill. Job Satisfaction and Job Performance Among the Middle Management Personnel of the Sudanese Public Service. University of Southern California,Faculty of the graduate School, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.