| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Cialis: Effects, Side Effects, Precautions, Risks and Warnings: An Original Cialis and Viagra Research Guide | 978-1-7250-6776-9 (1-7250-6776-5) | 2018 |
| Viagra: Effects, Side Effects, Precautions, Risks and Warnings: An Original Viagra Research Guide | 978-1-7232-6943-1 (1-7232-6943-3) | 2018 |