| italiano | ita-000 |
| ASPO | |
| dansk | dan-000 | ASPO |
| Deutsch | deu-000 | ASPO |
| English | eng-000 | Association for the Study of Peak Oil and Gas |
| suomi | fin-000 | ASPO |
| français | fra-000 | Association for the Study of Peak Oil and Gas |
| español | spa-000 | Asociación para el Estudio del Pico del Petróleo y del Gas |
| svenska | swe-000 | ASPO |