Cheah, P. Y. (1984). The cognitive attainment of Form IV and V students in relation to the conceptual demands of Malaysian chemistry curriculum.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Cheah, Peh Yean. The Cognitive Attainment of Form IV and V Students in Relation to the Conceptual Demands of Malaysian Chemistry Curriculum. 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Cheah, Peh Yean. The Cognitive Attainment of Form IV and V Students in Relation to the Conceptual Demands of Malaysian Chemistry Curriculum. 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.