Helen Ball. (2018). Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations) (edition.). HarperCollins UK.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Helen Ball. Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations). edition. HarperCollins UK, 2018.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Helen Ball. Cambridge International AS and A Level Mathematics Pure Mathematics 2 and 3 Student Book (Cambridge International Examinations). edition. HarperCollins UK, 2018.
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