| | WORLDWATCH INSTITUTE |
| | 1776 Massachusetts Ave., NW, Washington, DC 20036 USA |
| http://www.worldwatch.org |
| energetyka i alternatywne techniki pozyskania energii |
| 2005 | | Hydrogen Futures: Toward a Sustainable Energy System | abs | | 92 | | str | 0,4 | mb |
| ekonomia |
| 2006 | | State of the World 2006 | abs | | 269 | | str | 1,7 | mb |
| 2004 | | State of the World 2005 | abs | | 259 | | str | 2,7 | mb |
| 2004 | | Raport o stanie świata 2004 | abs | | 224 | | str | 3,3 | mb |