Lew, T. S. (1987). The relationship between the cognitive level of Form Four science students and their understanding of physics concepts.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Lew, Tan Sin. The Relationship Between the Cognitive Level of Form Four Science Students and Their Understanding of Physics Concepts. 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Lew, Tan Sin. The Relationship Between the Cognitive Level of Form Four Science Students and Their Understanding of Physics Concepts. 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.