Siti Salmah. (2021). The impact of social class and ability group on students academic achievement: A case study of primary schools in North Sumatra Province, Indonesia : a proposed framework for improvement. Kulliyyah of Education, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Siti Salmah. The Impact of Social Class and Ability Group on Students Academic Achievement: A Case Study of Primary Schools in North Sumatra Province, Indonesia : A Proposed Framework for Improvement. Kuala Lumpur: Kulliyyah of Education, International Islamic University Malaysia, 2021.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Siti Salmah. The Impact of Social Class and Ability Group on Students Academic Achievement: A Case Study of Primary Schools in North Sumatra Province, Indonesia : A Proposed Framework for Improvement. Kulliyyah of Education, International Islamic University Malaysia, 2021.