Cambridge University Press. (2018). Cambridge IELTS 13 with Answers: Academic: Fully Update Version: Examination Papers From University Of Cambridge Esol Examination (Fully Updated Version.). Cambridge University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Cambridge University Press. Cambridge IELTS 13 with Answers: Academic: Fully Update Version: Examination Papers From University Of Cambridge Esol Examination. Fully Updated Version. Cambridge: Cambridge University Press, 2018.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Cambridge University Press. Cambridge IELTS 13 with Answers: Academic: Fully Update Version: Examination Papers From University Of Cambridge Esol Examination. Fully Updated Version. Cambridge University Press, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.