Ooi, S. P. (1994). Case study of a SINGLAS accredited private commercial laboratory specialising in chemical and biological testing: Its operations, its directions.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ooi, Say Peng. Case Study of a SINGLAS Accredited Private Commercial Laboratory Specialising in Chemical and Biological Testing: Its Operations, Its Directions. 1994.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ooi, Say Peng. Case Study of a SINGLAS Accredited Private Commercial Laboratory Specialising in Chemical and Biological Testing: Its Operations, Its Directions. 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.