Mohd. Salleh Abu. (1990). An exploration study of mathematical difficulties experienced by the pre-university students at Universiti Teknologi Malaysia and the relation to the structure of mathematical ability. Brunel University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mohd. Salleh Abu. An Exploration Study of Mathematical Difficulties Experienced by the Pre-university Students at Universiti Teknologi Malaysia and the Relation to the Structure of Mathematical Ability. Uxbridge: Brunel University, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Mohd. Salleh Abu. An Exploration Study of Mathematical Difficulties Experienced by the Pre-university Students at Universiti Teknologi Malaysia and the Relation to the Structure of Mathematical Ability. Brunel University, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.