| Autor | Częstotliwość |
| Environmental Action Programme for Central and Eastern Europe |
3 |
| Ackermann, Richard |
1 |
| Hertzman, Clyde 1953-2013 |
1 |
| Klavens, Jonathan, 1965- 1965- |
1 |
| Ministerial Conference "Environment for Europe ((1993, Lucerne, Switzerland)) |
1 |
| Organization for Economic Co-operation and Development |
1 |
| World Bank |
1 |
| Zamparutti, Anthony, 1962- 1962- |
1 |
