| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Content Marketing: Growth Strategies to Stay Ahead in the Changing World of Content Marketing and Maximize ROI | 978-1-95O766-O7-9 (1-95O766-O7-1) | 2019 |
R. P. · Ralph Pierce · Ralph Powers · Rolf Persch · Rolf Prigge