Sim, C. P. (1999). Relationship between motivation and academic achievement among form four Malaysian students.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sim, Chzia Poaw. Relationship Between Motivation and Academic Achievement Among Form Four Malaysian Students. 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sim, Chzia Poaw. Relationship Between Motivation and Academic Achievement Among Form Four Malaysian Students. 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.