1. ETS Official Guide to the TOEFL Test (4th Edition) by ETS
2. Cracking the TOEFL iBT (2016-2017) Edition By Princeton Review
3. Kaplan TOEFL iBT Premier 2016-2017 with 4 Practice Tests by Kaplan Test Prep
4. Practice Exercises for the TOEFL with MP3 CD by Pamela J. Sharpe
5. 240 Writing Topics: with Sample Essays by LIKE Test Prep
6. The Only Grammar Book You’ll Ever Need: A One-Stop Source for Every Writing Assignment by Susan Thurman