Adam, Z. I. (2017). Customer retention in the Nigerian mobile telecommunication industry. Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Adam, Zahra Ibrahim. Customer Retention in the Nigerian Mobile Telecommunication Industry. Kuala Lumpur: Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia, 2017.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Adam, Zahra Ibrahim. Customer Retention in the Nigerian Mobile Telecommunication Industry. Kulliyyah of Economics and Management Sciences, International Islamic University Malaysia, 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.