Abdullah Osman. (2002). A study on effectiveness of training and maintenance of competency towards trade efficiency and quality in the army.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Abdullah Osman. A Study on Effectiveness of Training and Maintenance of Competency Towards Trade Efficiency and Quality in the Army. 2002.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Abdullah Osman. A Study on Effectiveness of Training and Maintenance of Competency Towards Trade Efficiency and Quality in the Army. 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.