Singh, C. K. S. (2014). Portfolio as an assessment tool in selected Malaysian English as a Second Language secondary classrooms (IR).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Singh, Charanjit Kaur Swaran. Portfolio as an Assessment Tool in Selected Malaysian English as a Second Language Secondary Classrooms (IR). 2014.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Singh, Charanjit Kaur Swaran. Portfolio as an Assessment Tool in Selected Malaysian English as a Second Language Secondary Classrooms (IR). 2014.
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