Mariani Md. Nor. (1998). An investigation into the teaching and learning of ratio and proportion to Malaysian secondary School pupils.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mariani Md. Nor. An Investigation into the Teaching and Learning of Ratio and Proportion to Malaysian Secondary School Pupils. 1998.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Mariani Md. Nor. An Investigation into the Teaching and Learning of Ratio and Proportion to Malaysian Secondary School Pupils. 1998.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.