Ching, S. T. (2000). The mastery of some generic structures of geography by a group of upper secondary school pupils in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ching, Siew Tuan. The Mastery of Some Generic Structures of Geography by a Group of Upper Secondary School Pupils in Singapore. 2000.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ching, Siew Tuan. The Mastery of Some Generic Structures of Geography by a Group of Upper Secondary School Pupils in Singapore. 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.