| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1994 | 978-0-9643401-0-7 | Robin Tulleners | 20 Secrets For Landscape Contractors |
| 1995 | 978-0-9643401-1-4 | Robin Tulleners | 20 Secretos Para Contratistas De Jardineria (Spanish Edition) |
| '' | 978-0-9643401-2-1 | '' | 20 Secrets For Masonry and Concrete Contractors |