| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Investigating and Evaluating Environmental Issues and Actions: Skill Development Program: Spiral | 978-1-58874-281-O (1-58874-281-4) | 2003 | Harold R. Hungerford · Trudi L. Volk · John M. Ramsey · Ralph A. Litherland |