Ong, K. (1970). Development and problems of Singapore secondary education, 1947-1969: With special reference to the English-medium secondary schools.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ong, Kim-siong. Development and Problems of Singapore Secondary Education, 1947-1969: With Special Reference to the English-medium Secondary Schools. 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ong, Kim-siong. Development and Problems of Singapore Secondary Education, 1947-1969: With Special Reference to the English-medium Secondary Schools. 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.