Raymond Murphy
Essential Grammar in Use with Answers: A Self-Study Reference and Practice Book for Elementary Learners of English
Essential Grammar in Use Book with Answers and Interactive eBook Spanish Edition
English Grammar in Use: A Self-study Reference and Practice Book for Intermediate Learners of English - with Answers
Grammar in Use Intermediate Student's Book with Answers and CD-ROM: Self-study Reference and Practice for Students of North American English
Essential Grammar in Use With Answers
Basic Grammar in Use Answer key: Reference and Practice for Students of English
Grammar in Use Intermediate: Self-study Reference and Practice for Students of North American English - with Answers
English Grammar In Use Klett Edition: A Self-study Reference and Practice Book for Intermediate Students of English