Writing Academic English: Answer Key
Introduction to Academic Writing, Third Edition (The Longman Academic Writing Series, Level 3)
First Steps in Academic Writing (The Longman Academic Writing Series, Level 2) (2nd Edition)
Fundamentals of Academic Writing (The Longman Academic Writing Series, Level 1)
Writing Academic English, Fourth Edition (The Longman Academic Writing Series, Level 4)
Focus on Grammar 4: An Integrated Skills Approach, Third Edition