Chia, C. S. C. (1994). An evaluation of materials designed for teaching report writing and oral presentation at polytechnics in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Chia, Christian Shyh Chiuan. An Evaluation of Materials Designed for Teaching Report Writing and Oral Presentation at Polytechnics in Singapore. 1994.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Chia, Christian Shyh Chiuan. An Evaluation of Materials Designed for Teaching Report Writing and Oral Presentation at Polytechnics in Singapore. 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.