Norwahida Binti Zakaria. (2016). The effect of recycling to the properties of different brands of polyethylene terephthalate (pet) bottle. School of Material Engineering, University Malaysia Perlis.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Norwahida Binti Zakaria. The Effect of Recycling to the Properties of Different Brands of Polyethylene Terephthalate (pet) Bottle. Perlis, Malaysia: School of Material Engineering, University Malaysia Perlis, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Norwahida Binti Zakaria. The Effect of Recycling to the Properties of Different Brands of Polyethylene Terephthalate (pet) Bottle. School of Material Engineering, University Malaysia Perlis, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.