Sim, A. N. (1994). A study of the approaches and methodology in English language teaching in a secondary school in Singapore.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sim, Ay Nar. A Study of the Approaches and Methodology in English Language Teaching in a Secondary School in Singapore. 1994.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sim, Ay Nar. A Study of the Approaches and Methodology in English Language Teaching in a Secondary School in Singapore. 1994.
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