圖書| 1. | GIIGNL(2019)。GIIGNL 2019 Annual Report。   |
| 2. | EIA(2019)。Short-Term Energy Outlook: October 2019。 |
| 3. | GIIGNL(2015)。GIIGNL 2015 Annual Report, Quantities (in 106 T) received in 2014 by the importing countries from the exporting countries。 |
| 4. | GIIGNL(2016)。GIIGNL 2016 Annual Report, Quantities (in 106 T) received in 2015 by the importing countries from the exporting countries。 |
| 5. | GIIGNL(2017)。GIIGNL 2017 Annual Report, Quantities (in 106 T) received in 2016 by the importing countries from the exporting countries。 |
| 6. | GIIGNL(2018)。GIIGNL 2018 Annual Report, Quantities (in 106 T) received in 2017 by the importing countries from the exporting countries。 |