Hewings, M. (1999). Advanced grammar in use: A self-study reference and practice book for advanced learners of English : with answers. Cambridge University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hewings, Martin. Advanced Grammar in Use: A Self-study Reference and Practice Book for Advanced Learners of English : With Answers. Cambridge: Cambridge University Press, 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hewings, Martin. Advanced Grammar in Use: A Self-study Reference and Practice Book for Advanced Learners of English : With Answers. Cambridge University Press, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.