World Coal Report. ABS Energy Research.
Tohutoru Kātū Chicago (17th ed.)World Coal Report. ABS Energy Research.
Tohutoro MLA (9th ed.)World Coal Report. ABS Energy Research.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.
Tohutoro APA (7th ed.)