Ahmed, S. (2016). Lean six sigma and its effect on quality performance in Malaysian hospitals. Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ahmed, Selim. Lean Six Sigma and Its Effect on Quality Performance in Malaysian Hospitals. Gombak, Selangor: Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ahmed, Selim. Lean Six Sigma and Its Effect on Quality Performance in Malaysian Hospitals. Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.