| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Valuable Content Marketing: How to make quality content the key to your business success | 978-0-7494-6580-3 (0-7494-6580-8) | 2013 | Sonja Jefferson |
| Valuable Content Marketing: How to Make Quality Content Your Key to Success | 978-0-7494-7327-3 (0-7494-7327-4) | 2015 | " |