Sharifuddin Zainuddin. (1997). An analysis of perceived service quality in the road transport department of Malaysia. University of Pittsburgh.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sharifuddin Zainuddin. An Analysis of Perceived Service Quality in the Road Transport Department of Malaysia. Pittsburgh: University of Pittsburgh, 1997.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sharifuddin Zainuddin. An Analysis of Perceived Service Quality in the Road Transport Department of Malaysia. University of Pittsburgh, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.