World Coal Report. ABS Energy Research.
Chicago Style (17. basım) AtıfWorld Coal Report. ABS Energy Research.
MLA (9th ed.) AtıfWorld Coal Report. ABS Energy Research.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
World Coal Report. ABS Energy Research.
Chicago Style (17. basım) AtıfWorld Coal Report. ABS Energy Research.
MLA (9th ed.) AtıfWorld Coal Report. ABS Energy Research.