World Coal Report. ABS Energy Research.
Chicago-čujuhus (17. p.)World Coal Report. ABS Energy Research.
MLA-čujuhus (9. p.)World Coal Report. ABS Energy Research.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)