Palanisamy K. Veloo. (1986). Cognitive development and acquisition of the mathematical concepts of fraction, ratio and proportion: A study of a sample of Malaysian urban secondary school pupils.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Palanisamy K. Veloo. Cognitive Development and Acquisition of the Mathematical Concepts of Fraction, Ratio and Proportion: A Study of a Sample of Malaysian Urban Secondary School Pupils. 1986.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Palanisamy K. Veloo. Cognitive Development and Acquisition of the Mathematical Concepts of Fraction, Ratio and Proportion: A Study of a Sample of Malaysian Urban Secondary School Pupils. 1986.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.