| Name | Description |
| Citation Styles-Online! A Reference Guide to Using Internet Sources | Examples of how to cite from APA, MLA, CBE and Chicago style manuals. |
| EarthTrends: the environmental information portal | Provides data on environmental topics, both globally and country-specific. |
| National Environmental Publications Information System | Over 7000 EPA publications in a searchable database. |
| National Library for the Environment | Searches many useful resources |