Ng, A. L. T. (1968). A study of the costs of primary and secondary education in Singapore: 1945-1963. Department of Economics and Economic Research Centre.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ng, Andrew Lian Timn. A Study of the Costs of Primary and Secondary Education in Singapore: 1945-1963. University of Singapore, Singapore: Department of Economics and Economic Research Centre, 1968.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ng, Andrew Lian Timn. A Study of the Costs of Primary and Secondary Education in Singapore: 1945-1963. Department of Economics and Economic Research Centre, 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.