| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| GMAT Prep Book 2020 & 2021: GMAT Secrets Study Guide, Full-Length Practice Test, Detailed Answer Explanations: | 978-1-5167-1240-3 (1-5167-1240-4) | 2019 |
| GMAT Prep Book: GMAT Secrets Study Guide 2019 & 2020, Full-Length Practice Test, Step-by-Step Review Video Tutorials for the GMAT Exam: | 978-1-5167-1062-1 (1-5167-1062-2) | 2019 |