Yap, K. L. (2000). A survey on factors that contribute to form four students taking private mathematics tuition in the Petaling district.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Yap, Kwee Lan. A Survey on Factors That Contribute to Form Four Students Taking Private Mathematics Tuition in the Petaling District. 2000.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Yap, Kwee Lan. A Survey on Factors That Contribute to Form Four Students Taking Private Mathematics Tuition in the Petaling District. 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.